USN-8282-2 (UBUNTU-CVE-2026-41292)

Vulnerability from osv_ubuntu – Published: 2026-06-02 18:26 – Updated: 2026-06-30 15:55 – Source website
VLAI
Summary
unbound vulnerabilities
Details

USN-8282-1 fixed vulnerabilities in Unbound. This update provides the corresponding updates for CVE-2026-41292 in Ubuntu 18.04 LTS and Ubuntu 20.04 LTS and CVE-2026-42959, CVE-2026-42960 in Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.

Original advisory details:

Andrew Griffiths discovered that Unbound did not properly handle certain DNSCrypt packets. A remote attacker could possibly use this issue to cause Unbound to crash, resulting in a denial of service. (CVE-2026-32792)

Qifan Zhang discovered that Unbound incorrectly handled DNSSEC validation in certain situations. A remote attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-33278)

Qifan Zhang discovered that Unbound incorrectly handled certain ghost domain name records. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-40622)

Qifan Zhang discovered that Unbound did not properly limit processing of long EDNS option lists. A remote attacker could possibly use this issue to cause Unbound to use excessive resources, leading to a denial of service. (CVE-2026-41292)

Qifan Zhang discovered that Unbound incorrectly handled jostle logic under certain circumstances. A remote attacker could possibly use this issue to cause Unbound to use excessive resources, leading to a denial of service. (CVE-2026-42534)

Qifan Zhang discovered that Unbound did not properly bound NSEC3 hash calculations. A remote attacker could possibly use this issue to cause Unbound to use excessive resources, leading to a denial of service. (CVE-2026-42923)

Qifan Zhang discovered that Unbound incorrectly handled multiple EDNS options in certain situations. A remote attacker could possibly use this issue to cause Unbound to crash, resulting in a denial of service, or execute arbitrary code. This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-42944)

Qifan Zhang discovered that Unbound incorrectly handled DNSSEC validation of malicious content. A remote attacker could possibly use this issue to cause Unbound to crash, resulting in a denial of service. (CVE-2026-42959)

TaoFei Guo, Yang Luo, and JianJun Chen discovered that Unbound incorrectly handled delegation processing in certain situations. A remote attacker could possibly use this issue to poison the DNS cache and obtain sensitive information. (CVE-2026-42960)

Qifan Zhang discovered that Unbound did not properly bound name compression in certain cases. A remote attacker could possibly use this issue to cause Unbound to use excessive resources, leading to a denial of service. (CVE-2026-44390)

Qifan Zhang discovered that Unbound had a use-after-free issue in RPZ handling. A remote attacker could possibly use this issue to cause Unbound to crash, resulting in a denial of service, or execute arbitrary code. This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-44608)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
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              "id": "CVE-2026-42959",
              "severity": [
                {
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            {
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            {
              "id": "CVE-2026-42960",
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            "binary_version": "1.5.8-1ubuntu1.1+esm3"
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            "binary_version": "1.5.8-1ubuntu1.1+esm3"
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            "binary_name": "unbound-host",
            "binary_version": "1.5.8-1ubuntu1.1+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "unbound",
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      ]
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            {
              "id": "CVE-2026-41292",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Red",
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                },
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                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42959",
              "severity": [
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                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Red",
                  "type": "CVSS_V4"
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              "id": "CVE-2026-42960",
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                  "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber",
                  "type": "CVSS_V4"
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                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
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                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
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        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
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            "binary_name": "libunbound2",
            "binary_version": "1.6.7-1ubuntu2.6+esm4"
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            "binary_version": "1.6.7-1ubuntu2.6+esm4"
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            {
              "id": "CVE-2026-41292",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Red",
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                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42959",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Red",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42960",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libunbound8",
            "binary_version": "1.9.4-2ubuntu1.11+esm1"
          },
          {
            "binary_name": "python-unbound",
            "binary_version": "1.9.4-2ubuntu1.11+esm1"
          },
          {
            "binary_name": "python3-unbound",
            "binary_version": "1.9.4-2ubuntu1.11+esm1"
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            "binary_version": "1.9.4-2ubuntu1.11+esm1"
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        "1.9.4-2ubuntu1.3",
        "1.9.4-2ubuntu1.4",
        "1.9.4-2ubuntu1.5",
        "1.9.4-2ubuntu1.6",
        "1.9.4-2ubuntu1.8",
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  ],
  "aliases": [],
  "details": "USN-8282-1 fixed vulnerabilities in Unbound. This update provides the\ncorresponding updates for CVE-2026-41292 in Ubuntu 18.04 LTS and Ubuntu\n20.04 LTS and CVE-2026-42959, CVE-2026-42960 in Ubuntu 14.04 LTS, Ubuntu\n16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n Andrew Griffiths discovered that Unbound did not properly handle certain\n DNSCrypt packets. A remote attacker could possibly use this issue to cause\n Unbound to crash, resulting in a denial of service. (CVE-2026-32792)\n\n Qifan Zhang discovered that Unbound incorrectly handled DNSSEC validation\n in certain situations. A remote attacker could possibly use this issue to\n execute arbitrary code. This issue only affected Ubuntu 24.04 LTS,  Ubuntu\n 25.10, and Ubuntu 26.04 LTS. (CVE-2026-33278)\n\n Qifan Zhang discovered that Unbound incorrectly handled certain ghost\n domain name records. A remote attacker could possibly use this issue to\n cause a denial of service. This issue only affected Ubuntu 24.04 LTS,\n Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-40622)\n\n Qifan Zhang discovered that Unbound did not properly limit processing of\n long EDNS option lists. A remote attacker could possibly use this issue to\n cause Unbound to use excessive resources, leading to a denial of service.\n (CVE-2026-41292)\n\n Qifan Zhang discovered that Unbound incorrectly handled jostle logic under\n certain circumstances. A remote attacker could possibly use this issue to\n cause Unbound to use excessive resources, leading to a denial of service.\n (CVE-2026-42534)\n\n Qifan Zhang discovered that Unbound did not properly bound NSEC3 hash\n calculations. A remote attacker could possibly use this issue to cause\n Unbound to use excessive resources, leading to a denial of service.\n (CVE-2026-42923)\n\n Qifan Zhang discovered that Unbound incorrectly handled multiple EDNS\n options in certain situations. A remote attacker could possibly use this\n issue to cause Unbound to crash, resulting in a denial of service, or\n execute arbitrary code. This issue only affected Ubuntu 24.04 LTS,  Ubuntu\n 25.10, and Ubuntu 26.04 LTS. (CVE-2026-42944)\n\n Qifan Zhang discovered that Unbound incorrectly handled DNSSEC validation\n of malicious content. A remote attacker could possibly use this issue to\n cause Unbound to crash, resulting in a denial of service.\n (CVE-2026-42959)\n\n TaoFei Guo, Yang Luo, and JianJun Chen discovered that Unbound\n incorrectly handled delegation processing in certain situations. A remote\n attacker could possibly use this issue to poison the DNS cache and obtain\n sensitive information. (CVE-2026-42960)\n\n Qifan Zhang discovered that Unbound did not properly bound name\n compression in certain cases. A remote attacker could possibly use this\n issue to cause Unbound to use excessive resources, leading to a denial of\n service. (CVE-2026-44390)\n\n Qifan Zhang discovered that Unbound had a use-after-free issue in RPZ\n handling. A remote attacker could possibly use this issue to cause Unbound\n to crash, resulting in a denial of service, or execute arbitrary code.\n This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04\n LTS. (CVE-2026-44608)",
  "id": "USN-8282-2",
  "modified": "2026-06-30T15:55:19Z",
  "published": "2026-06-02T18:26:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8282-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-41292"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42959"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42960"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "unbound vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-41292",
    "UBUNTU-CVE-2026-42959",
    "UBUNTU-CVE-2026-42960"
  ]
}



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