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      "text": "Moderate"
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        "category": "summary",
        "text": "An update for unbound is now available for Red Hat Enterprise Linux 10.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
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        "text": "The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. \n\nSecurity Fix(es):\n\n* unbound: Unbound DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance (CVE-2026-42960)\n\n* unbound: Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS (CVE-2026-42923)\n\n* unbound: Unbound: Denial of Service due to locking inconsistency during RPZ XFR reload (CVE-2026-44608)\n\nBug Fix(es) and Enhancement(s):\n\n* Update to latest 1.26 (JIRA:RHEL-246536)\n\n* [RHEL-10][AppStream] Packages present in comps but missing from repo: unbound (JIRA:RHEL-171309)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes linked from the References section.",
        "title": "Details"
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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_97121.json"
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        "name": "Uncontrolled Resource Consumption"
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          "text": "2479825"
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          "category": "description",
          "text": "A flaw was found in Unbound\u0027s DNSSEC validator where the code path for consulting the negative cache for DS records does not honor the limit on NSEC3 hash calculations introduced in version 1.19.1. An adversary who controls a DNSSEC-signed zone can sign NSEC3 records with high iteration counts for child delegations, causing Unbound to perform excessive hash computations while holding a global lock on the negative cache. This temporarily blocks other resolver threads from accessing the negative cache, leading to degraded DNS resolution performance for the duration of the attack.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "unbound: Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate. The flaw can be remotely triggered without authentication, but the impact is limited to service degradation rather than a full denial-of-service.The Unbound process does not crash,a global negative cache lock is held during excessive NSEC3 hash computations, temporarily blocking other resolver threads. The root cause is a negative cache code path that bypasses the existing NSEC3 hash computation limits.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42923"
        },
        {
          "category": "external",
          "summary": "RHBZ#2479825",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479825"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-42923",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42923"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42923",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42923"
        }
      ],
      "release_date": "2026-05-20T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS"
    },
    {
      "cve": "CVE-2026-42955",
      "cwe": {
        "id": "CWE-354",
        "name": "Improper Validation of Integrity Check Value"
      },
      "discovery_date": "2026-07-22T14:02:09.010257+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506144"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A \"ghost domain names\" flaw in Unbound allows a remote attacker controlling a domain to manipulate cached DNS records. By extending the lifetime of outdated DNS information, an attacker can cause clients to receive stale or misleading DNS responses.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: DNS cache integrity issue",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Low impact DNS cache integrity issue in Unbound allows an attacker to extend the window for serving outdated DNS information. Exploitation requires an adversary to control a ghost zone and query a vulnerable Unbound instance. The risk is elevated if the non-default `harden-referral-path: yes` configuration is enabled, as it removes the need for a client query.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42955"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506144",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506144"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-42955",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42955"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42955",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42955"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42955.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42955.txt"
        }
      ],
      "release_date": "2026-07-22T13:05:53.695000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, ensure harden-referral-path is set to no (the default) to prevent Unbound from implicitly triggering the vulnerable cache overwrites.\nAdditionally, restrict recursive DNS access strictly to trusted clients to prevent external attackers from manually triggering the flaw.\nRestart the Unbound service to apply these configuration changes.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "unbound: Unbound: DNS cache integrity issue"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "TaoFei Guo"
          ],
          "organization": "Peking University"
        },
        {
          "names": [
            "Yang Luo",
            "JianJun Chen"
          ],
          "organization": "Tsinghua University"
        }
      ],
      "cve": "CVE-2026-42960",
      "cwe": {
        "id": "CWE-349",
        "name": "Acceptance of Extraneous Untrusted Data With Trusted Data"
      },
      "discovery_date": "2026-05-19T12:09:50.308000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2479821"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Unbound\u0027s handling of DNS reply messages, complementing the earlier CVE-2025-11411 fix. Unbound accepts and caches address records from the additional section of DNS replies when they accompany authority section RRSets other than NS (such as MX records). A malicious actor who can inject crafted DNS responses\u2014via packet spoofing or fragmentation attacks\u2014can exploit this to poison Unbound\u0027s cache with attacker-controlled address records, potentially redirecting DNS resolution for affected domains.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate. Exploitation requires the attacker to successfully inject or spoof DNS response packets, which increases attack complexity. However, successful exploitation can result in DNS cache poisoning, allowing the attacker to redirect DNS resolution for affected domains.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42960"
        },
        {
          "category": "external",
          "summary": "RHBZ#2479821",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479821"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-42960",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42960"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42960",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42960"
        }
      ],
      "release_date": "2026-05-20T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: Unbound DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance"
    },
    {
      "cve": "CVE-2026-44608",
      "cwe": {
        "id": "CWE-367",
        "name": "Time-of-check Time-of-use (TOCTOU) Race Condition"
      },
      "discovery_date": "2026-05-20T10:00:58.538612+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2480126"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Unbound. When operating in a multi-threaded configuration with specific Response Policy Zones (RPZ) using \u0027rpz-nsip\u0027 or \u0027rpz-nsdname\u0027 triggers, a locking inconsistency during an RPZ zone transfer (XFR) reload can occur. This timing issue may allow an adversary to trigger a heap use-after-free vulnerability, leading to a system crash and a Denial of Service (DoS).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Denial of Service due to locking inconsistency during RPZ XFR reload",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-44608"
        },
        {
          "category": "external",
          "summary": "RHBZ#2480126",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480126"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-44608",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-44608"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-44608",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44608"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt"
        }
      ],
      "release_date": "2026-05-20T09:21:57.360000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, avoid using `rpz-nsip` or `rpz-nsdname` triggers within Response Policy Zones (RPZ) that are configured for zone transfer (XFR) reloads. Alternatively, configure Unbound to use local RPZ files instead of XFR for these zones, as local RPZ files do not trigger the vulnerability. A restart of the Unbound service may be required for configuration changes to take effect, which could temporarily interrupt DNS resolution.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: Unbound: Denial of Service due to locking inconsistency during RPZ XFR reload"
    },
    {
      "cve": "CVE-2026-44621",
      "cwe": {
        "id": "CWE-617",
        "name": "Reachable Assertion"
      },
      "discovery_date": "2026-07-22T14:02:28.259556+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506149"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in libunbound, a library used by applications for DNS resolution. A remote attacker could exploit this vulnerability by sending specially crafted network traffic. This could cause applications using libunbound to terminate unexpectedly, leading to a denial of service (DoS). This occurs when the \u0027unwanted-reply-threshold\u0027 is configured, and the application attempts to call a cleanup function that is not properly allowed, resulting in a fatal exit.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libunbound: libunbound: Denial of Service via specially crafted network traffic",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A Moderate denial of service flaw exists in `libunbound` where applications configured with `unwanted-reply-threshold` can be terminated by specially crafted network traffic. This occurs when the `libworker_alloc_cleanup` function is called, which is not on the allow list for embedded applications. The `unbound` daemon itself is not affected as it uses a different, allowed function.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-44621"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506149",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506149"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-44621",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-44621"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-44621",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44621"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44621.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44621.txt"
        }
      ],
      "release_date": "2026-07-22T13:06:28.947000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
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          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "libunbound: libunbound: Denial of Service via specially crafted network traffic"
    },
    {
      "cve": "CVE-2026-44687",
      "cwe": {
        "id": "CWE-193",
        "name": "Off-by-one Error"
      },
      "discovery_date": "2026-07-22T14:01:04.501595+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506130"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An off-by-one error in Unbound\u0027s default harden-below-nxdomain logic can lead to a denial of service. When an intermediate label under a DNSSEC-signed zone is queried, the flaw incorrectly bypasses configured stub or forward zones, disrupting their name resolution.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Denial of Service due to \u0027harden-below-nxdomain\u0027 logic bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Low impact. This vulnerability in Unbound\u0027s `harden-below-nxdomain` logic, enabled by default in Red Hat products, can lead to a denial of service. Exploitation requires a specific configuration of stub or forward zones below a DNSSEC-signed zone and a targeted query for an intermediate label, making the attack complex and limiting its overall impact.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-44687"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506130",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506130"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-44687",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-44687"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-44687",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44687"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44687.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44687.txt"
        }
      ],
      "release_date": "2026-07-22T13:06:42.751000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "unbound: Unbound: Denial of Service due to \u0027harden-below-nxdomain\u0027 logic bypass"
    },
    {
      "cve": "CVE-2026-46582",
      "cwe": {
        "id": "CWE-358",
        "name": "Improperly Implemented Security Check for Standard"
      },
      "discovery_date": "2026-07-22T14:01:50.151347+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506139"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Unbound, a Domain Name System (DNS) resolver. A remote attacker can exploit a vulnerability in how Unbound handles expired DNSSEC (DNS Security Extensions) records. By injecting a replayed wildcard record set, an attacker can cause Unbound to temporarily consider it secure, leading to the caching of a poisoned record. This can result in information disclosure, where a legitimate DNS record is incorrectly resolved as a wildcard record, potentially misdirecting network traffic.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Information disclosure via DNSSEC wildcard replay",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue has a Low impact as it requires a sophisticated attacker to inject specific DNSSEC wildcard replay data. The vulnerability in Unbound\u0027s handling of expired DNSSEC records could lead to temporary information disclosure, where a legitimate DNS record is briefly misresolved as a wildcard. This limited impact and the high attack complexity contribute to its Low severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-46582"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506139",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506139"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-46582",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-46582"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-46582",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46582"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-46582.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-46582.txt"
        }
      ],
      "release_date": "2026-07-22T13:07:40.588000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "unbound: Unbound: Information disclosure via DNSSEC wildcard replay"
    },
    {
      "cve": "CVE-2026-50045",
      "cwe": {
        "id": "CWE-406",
        "name": "Insufficient Control of Network Message Volume (Network Amplification)"
      },
      "discovery_date": "2026-07-22T14:01:36.361723+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506136"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A vulnerability in Unbound allows a remote attacker to bypass upstream amplification limits by querying a deeply nested name under a DNSSEC-signed parent. This triggers excessive outbound traffic per query, potentially causing a denial of service (DoS).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Denial of Service via DNSSEC query amplification bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A Moderate flaw in Unbound allows remote attackers to bypass max-global-quota limits using crafted DNSSEC queries. This causes upstream traffic amplification, potentially leading to a Denial of Service (DoS). This issue specifically affects Unbound versions 1.22.0 through 1.25.1.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50045"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506136",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506136"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50045",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50045"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50045",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50045"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50045.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50045.txt"
        }
      ],
      "release_date": "2026-07-22T13:07:55.730000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: Unbound: Denial of Service via DNSSEC query amplification bypass"
    },
    {
      "cve": "CVE-2026-50046",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "discovery_date": "2026-07-22T14:01:44.246005+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506138"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A use-after-free flaw was found in Unbound\u0027s DNS-over-TLS (DoT) forwarded query handling. A remote attacker can exploit a timing error during TLS handshake failures on a server under load to trigger a daemon crash, resulting in a Denial of Service (DoS).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Denial of Service due to freed pointer dereference in DNS-over-TLS handling",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Unbound installations within Red Hat environments are vulnerable to a denial of service, leading to a daemon crash, only when specifically configured with DNS-over-TLS (DoT) forwarding or stub zones that include an `#authname` suffix. Exploitation by a remote attacker necessitates precise timing during transient network failures. Default Unbound configurations, which do not employ DoT forwarding or stub zones with `#authname`, are not affected. Hence, this is rated having low impact.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50046"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506138",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506138"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50046",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50046"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50046",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50046"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50046.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50046.txt"
        }
      ],
      "release_date": "2026-07-22T13:08:08.710000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, avoid configuring Unbound with a `#authname` suffix in DNS-over-TLS (DoT) forwarding or stub zones if not strictly required. If the `#authname` suffix is necessary, restrict network access to the Unbound instance to trusted clients only. This may involve configuring firewall rules to limit inbound connections to the DoT port (typically 853) from known, secure sources. After modifying Unbound\u0027s configuration, the service must be reloaded or restarted for the changes to take effect. This action may temporarily interrupt DNS resolution services.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "unbound: Unbound: Denial of Service due to freed pointer dereference in DNS-over-TLS handling"
    },
    {
      "cve": "CVE-2026-50243",
      "cwe": {
        "id": "CWE-348",
        "name": "Use of Less Trusted Source"
      },
      "discovery_date": "2026-07-22T14:01:11.379595+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506132"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw in Unbound\u0027s respip module fails to verify the security status of incoming DNS answers when using response-ip rules or RPZ files. A remote attacker can exploit this by spoofing DNS answers to bypass DNSSEC protections and trigger unauthorized rewrites, redirecting clients to unintended locations.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Insecure DNS redirection via spoofed DNS answers",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability has a Low impact because it requires Unbound to be specifically configured with the \u0027respip\u0027 module and either a \u0027response-ip\u0027 redirect rule or an RPZ file. This non-default setup allows a remote attacker to spoof DNS answers, resulting in the insecure redirection of DNSSEC protected responses.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50243"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506132",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506132"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50243",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50243"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50243",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50243"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50243.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50243.txt"
        }
      ],
      "release_date": "2026-07-22T13:08:21.443000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
        },
        {
          "category": "workaround",
          "details": "If IP-based rewriting is unused, leave module-config configured as \"validator iterator\" and do not configure response-ip redirects or RPZ-IP triggers. If these features are required, ensure validator is placed before respip in module-config and restrict upstream peer access to reduce exposure to spoofed DNS answers.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "unbound: Unbound: Insecure DNS redirection via spoofed DNS answers"
    },
    {
      "cve": "CVE-2026-50248",
      "cwe": {
        "id": "CWE-345",
        "name": "Insufficient Verification of Data Authenticity"
      },
      "discovery_date": "2026-07-22T14:01:01.412412+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506129"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw in Unbound allows a remote attacker to replace an authenticated or Response Policy Zone (RPZ) by spoofing DNS records for configured primary hostnames. This enables the attacker to impersonate the primary server, leading to DNS cache poisoning or traffic redirection.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: DNS response policy replacement via hostname spoofing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A Moderate impact flaw in Unbound allows a remote attacker to replace a resolver\u0027s Response Policy Zone (RPZ) by spoofing A/AAAA records for configured primary hostnames. If successful, an attacker can manipulate response policies, redirect traffic, or poison the DNS cache.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50248"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506129",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506129"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50248",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50248"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50248",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50248"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50248.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50248.txt"
        }
      ],
      "release_date": "2026-07-22T13:08:32.488000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
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          "details": "Configure Response Policy Zones (RPZ) and secondary zone primary endpoints using explicit IP addresses rather than hostnames to prevent A/AAAA spoofing or resolution flaws. Additionally, restrict network access for zone transfers to trusted sources and reload or restart the unbound service for configuration changes to take effect.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L",
            "version": "3.1"
          },
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: Unbound: DNS response policy replacement via hostname spoofing"
    },
    {
      "cve": "CVE-2026-50251",
      "cwe": {
        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition"
      },
      "discovery_date": "2026-07-22T14:02:31.177447+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506150"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Unbound. A remote malicious actor can exploit a vulnerability by controlling a DNS delegation that returns specific glue records. This can cause Unbound to repeatedly clear its DNS caches, leading to a continuous Denial of Service (DoS) for DNS resolution.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: NLnet Labs Unbound: Denial of Service via crafted DNS glue records",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Moderate flaw in Unbound allows a remote attacker to trigger a denial of service by controlling a DNS delegation. When the `unwanted-reply-threshold` option is enabled, specially crafted glue records can cause Unbound to repeatedly clear its DNS caches, disrupting DNS resolution. This occurs due to Unbound\u0027s internal handling of locally routed 0.0.0.0/::0 glue records, which are incorrectly flagged as unwanted replies.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50251"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506150",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506150"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50251",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50251"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50251",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50251"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50251.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50251.txt"
        }
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      "release_date": "2026-07-22T13:08:43.577000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: NLnet Labs Unbound: Denial of Service via crafted DNS glue records"
    },
    {
      "cve": "CVE-2026-52863",
      "cwe": {
        "id": "CWE-1098",
        "name": "Data Element containing Pointer Item without Proper Copy Control Element"
      },
      "discovery_date": "2026-07-22T14:01:57.192434+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506141"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Unbound, a validating, recursive, and caching Domain Name System (DNS) resolver. When configured with specific modules and under heavy load, a memory corruption vulnerability can occur due to improper handling of view names during subquery processing. This issue could lead to a denial of service (DoS) by causing the Unbound server to crash.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Denial of service due to memory corruption under specific configurations.",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Moderate flaw in Unbound arises from memory corruption under specific, non-default configurations involving \u0027respip\u0027 or \u0027rpz\u0027 modules, subquery attachment, and \u0027access-control-view\u0027 when the server is under heavy load. The likelihood of a crash is low due to reliance on memory allocator behavior, but it could lead to a denial of service.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-52863"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506141",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506141"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-52863",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-52863"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-52863",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52863"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-52863.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-52863.txt"
        }
      ],
      "release_date": "2026-07-22T13:09:06.454000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "category": "none"
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          "category": "workaround",
          "details": "To mitigate this issue, avoid configuring Unbound with a combination of \u0027respip\u0027 or \u0027rpz\u0027 modules, subquery attachment features (such as respip CNAME redirection, dns64, or subnetcache), and \u0027access-control-view\u0027 if these functionalities are not strictly required. Disabling these specific configurations will prevent the conditions under which memory corruption can occur. Any changes to Unbound\u0027s configuration will require a service restart to take effect, which may temporarily interrupt DNS resolution services.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: Unbound: Denial of service due to memory corruption under specific configurations."
    },
    {
      "cve": "CVE-2026-54478",
      "cwe": {
        "id": "CWE-303",
        "name": "Incorrect Implementation of Authentication Algorithm"
      },
      "discovery_date": "2026-07-22T14:02:18.018465+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506146"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Unbound. When Unbound is configured to listen on a proxy-protocol port with DNS cookies enabled, it incorrectly computes the server cookie using the proxy\u0027s network address instead of the actual client\u0027s address. This vulnerability allows an off-path attacker to harvest a valid server cookie and replay it from a spoofed source, effectively bypassing DNS Cookie security checks intended to prevent DNS spoofing.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: DNS Cookie security bypass via incorrect server cookie calculation",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Low impact flaw in Unbound occurs when the DNS resolver is configured to use both `proxy-protocol-port` and `answer-cookie: yes`. The server cookie is incorrectly derived from the proxy\u0027s address, enabling an off-path attacker to bypass DNS Cookie security by replaying a harvested cookie. This vulnerability requires a specific, non-default configuration and has high attack complexity, limiting its impact.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-54478"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506146",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506146"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-54478",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-54478"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-54478",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54478"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-54478.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-54478.txt"
        }
      ],
      "release_date": "2026-07-22T13:09:18.323000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "unbound: Unbound: DNS Cookie security bypass via incorrect server cookie calculation"
    },
    {
      "cve": "CVE-2026-55708",
      "cwe": {
        "id": "CWE-213",
        "name": "Exposure of Sensitive Information Due to Incompatible Policies"
      },
      "discovery_date": "2026-07-22T14:01:07.322468+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506131"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw in Unbound\u0027s unbound-control utility can omit default-protected zones when initializing local data for a view. This allows queries for protected local names to bypass intended policies and leak to the public DNS, potentially exposing sensitive network information.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Information disclosure due to local policy bypass via unbound-control",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is a Low impact flaw in Unbound. A highly privileged user, by using `unbound-control` to create a view without initial local data, can cause queries for internal network names to be sent to public DNS servers. This bypasses local policy and could lead to the disclosure of internal network information.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-55708"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506131",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506131"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-55708",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-55708"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-55708",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55708"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-55708.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-55708.txt"
        }
      ],
      "release_date": "2026-07-22T13:09:30.500000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 3.1,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "unbound: Unbound: Information disclosure due to local policy bypass via unbound-control"
    },
    {
      "cve": "CVE-2026-55717",
      "cwe": {
        "id": "CWE-476",
        "name": "NULL Pointer Dereference"
      },
      "discovery_date": "2026-07-22T14:01:30.612289+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506135"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw in Unbound allows a remote attacker controlling a delegated domain to trigger a NULL pointer dereference and crash the daemon. Exploitation occurs when serve-expired: yes and specific response-ip or RPZ rules are configured, resulting in a denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Denial of Service via crafted DNS responses with expired records",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Moderate severity denial of service flaw in Unbound requires specific configurations, including `serve-expired: yes` and either `response-ip` or RPZ CNAME override rules. Exploitation depends on a remote attacker controlling a delegated domain and delaying DNS responses, which limits the immediate impact on typical Red Hat Unbound deployments not utilizing these advanced features.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-55717"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506135",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506135"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-55717",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-55717"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-55717",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55717"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-55717.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-55717.txt"
        }
      ],
      "release_date": "2026-07-22T13:09:40.927000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
        },
        {
          "category": "workaround",
          "details": "Ensure serve-expired remains disabled (default), or set serve-expired-client-timeout: 0 to bypass the vulnerable callback path. If serving expired answers is necessary, remove any response-ip CNAME redirect rules and RPZ rpz-cname-override entries. Additionally, use access-control to restrict query access, preventing untrusted clients from triggering the flaw via attacker-controlled names.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: Unbound: Denial of Service via crafted DNS responses with expired records"
    },
    {
      "cve": "CVE-2026-56416",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2026-07-22T14:01:40.980897+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506137"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A vulnerability in Unbound allows remote attackers using malicious DNSSEC-signed servers to send malformed records that trigger a heap buffer overflow. This can cause a denial of service or potential limited information disclosure.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Heap buffer overflow via malformed DNSSEC record",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Moderate impact flaw in Unbound allows a remote attacker to trigger a heap buffer overflow by providing specially crafted DNSSEC records from a malicious authoritative server. This can lead to a denial of service for the Unbound service or potentially limited information disclosure. Exploitation requires the Unbound DNSSEC validator to process malformed records, which may be exacerbated if `msg-buffer-size` is configured below its default value.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-56416"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506137",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506137"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-56416",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56416"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56416",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56416"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-56416.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-56416.txt"
        }
      ],
      "release_date": "2026-07-22T13:10:24.023000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, consider disabling DNSSEC validation in Unbound if it is not strictly required for your environment. This can be achieved by ensuring `module-config: \"iterator\"` is used in `unbound.conf` and that no `trust-anchor` or `auto-trust-anchor-file` directives are present. Disabling DNSSEC validation will reduce the security assurances provided by DNSSEC. Alternatively, configure Unbound to only perform DNSSEC validation for trusted zones. A restart of the Unbound service is required for changes to take effect.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "unbound: Unbound: Heap buffer overflow via malformed DNSSEC record"
    },
    {
      "cve": "CVE-2026-56444",
      "cwe": {
        "id": "CWE-772",
        "name": "Missing Release of Resource after Effective Lifetime"
      },
      "discovery_date": "2026-07-22T14:02:02.020386+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2506142"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A Denial of Service (DoS) flaw exists in Unbound under specific serve-expired and discard-timeout configurations. By sending crafted queries, a remote attacker can exhaust an internal counter, causing the server to drop new legitimate client queries and degrade resolution services.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "unbound: Unbound: Denial of Service due to incorrect client reply accounting with specific serve-expired configuration",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Low-impact flaw in Unbound can lead to a denial of service. While a remote attacker could exhaust the reply address counter with specially crafted queries, Red Hat products are not affected by default. The vulnerability requires specific non-default `serve-expired` and `discard-timeout` configurations, which are not present in standard Red Hat deployments.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-56444"
        },
        {
          "category": "external",
          "summary": "RHBZ#2506142",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506142"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-56444",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56444"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56444",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56444"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-56444.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-56444.txt"
        }
      ],
      "release_date": "2026-07-22T13:10:34.229000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T13:39:44+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:97121"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, ensure that Unbound is configured with `serve-expired-client-timeout` not greater than `discard-timeout` when `serve-expired: yes` is enabled. Alternatively, disable the `serve-expired` feature if it is not required. Red Hat\u0027s default configurations for Unbound prevent this vulnerability from being exploited.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "unbound: Unbound: Denial of Service due to incorrect client reply accounting with specific serve-expired configuration"
    }
  ]
}