rhsa-2025:19020
Vulnerability from csaf_redhat
Published
2025-10-27 17:46
Modified
2025-11-01 00:41
Summary
Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP2 security update

Notes

Topic
Red Hat JBoss Core Services Apache HTTP Server 2.4.62 Service Pack 2 is now available. Red Hat Product Security has rated this update as having a security impact of Important. 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.
Details
Red Hat JBoss Core Services is a set of supplementary software for Red Hat JBoss middleware products. This software, such as Apache HTTP Server, is common to multiple JBoss middleware products and packaged under Red Hat JBoss Core Services, to allow for faster distribution of updates and for a more consistent update experience. This release of Red Hat JBoss Core Services Apache HTTP Server 2.4.62 Service Pack 2 serves as a replacement for Red Hat JBoss Core Services Apache HTTP Server 2.4.62 Service Pack 1, and includes bug fixes and enhancements, which are documented in the Release Notes linked to in the References section. Security Fix(es): * expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing [jbcs-httpd-2.4] (CVE-2025-59375) * libxml2: Heap use after free (UAF) leads to Denial of service (DoS) [jbcs-httpd-2.4] (CVE-2025-49794) * libxml2: Null pointer dereference leads to Denial of service (DoS) [jbcs-httpd-2.4] (CVE-2025-49795) * libxml2: Type confusion leads to Denial of service (DoS) [jbcs-httpd-2.4] (CVE-2025-49796) * libxml2: Integer Overflow in xmlBuildQName() Leads to Stack Buffer Overflow in libxml2 [jbcs-httpd-2.4] (CVE-2025-6021) A Red Hat Security Bulletin which addresses further details about this flaw is available in the References section. For 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.
Terms of Use
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.


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      "title": "libxml2: Integer Overflow in xmlBuildQName() Leads to Stack Buffer Overflow in libxml2"
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          "text": "A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the \u003csch:name path=\"...\"/\u003e schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program\u0027s crash using libxml or other possible undefined behaviors.",
          "title": "Vulnerability description"
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          "text": "libxml: Heap use after free (UAF) leads to Denial of service (DoS)",
          "title": "Vulnerability summary"
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          "category": "other",
          "text": "This issue was rated with a severity impact of Important by Red Hat Product Security, as libxml can be used to parse XML coming from the network depending on how the program consumes it and uses the library. Additionally, although the initial report shows a crash due to invalid memory access (A:H), other undefined issues that can present data integrity due to the application overwriting sensitive data are not discarded (I:H).",
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          "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.",
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          "summary": "RHBZ#2372373",
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-49794",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-49794"
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          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.\n\nThe References section of this erratum contains a download link. You must be logged in to download the update.",
          "product_ids": [
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          "details": "There\u0027s no available mitigation other than avoid processing untrusted XML documents before updating to the libxml version containing the fix.",
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    },
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      "cwe": {
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          "category": "description",
          "text": "A NULL pointer dereference vulnerability was found in libxml2 when processing XPath XML expressions. This flaw allows an attacker to craft a malicious XML input to libxml2, leading to a denial of service.",
          "title": "Vulnerability description"
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          "text": "libxml: Null pointer dereference leads to Denial of service (DoS)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability marked as Important rather than Moderate due to its triggerability through untrusted input and impact on availability in a widely-used XML processing library like libxml2, which is often embedded in system-level and server-side applications. Although it is \"just\" a NULL pointer dereference\u2014typically classified as a DoS\u2014the context significantly elevates its severity. libxml2 frequently operates in environments that parse external XML content, such as web services, security scanners, and document processors. A crafted XML exploiting malformed XPath in Schematron schemas can reliably crash the application without requiring special privileges or user interaction.",
          "title": "Statement"
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          "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.",
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            "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:H",
            "version": "3.1"
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      "threats": [
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          "details": "Important"
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      ],
      "title": "libxml: Null pointer dereference leads to Denial of service (DoS)"
    },
    {
      "cve": "CVE-2025-49796",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2025-06-12T00:35:26.470000+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2372385"
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      "notes": [
        {
          "category": "description",
          "text": "A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to sensitive data being corrupted in memory.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "libxml: Type confusion leads to Denial of service (DoS)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The Red Hat Product Security team has evaluated this vulnerability as having an Important security impact, as libxml can be used to parse XML from the network depending on how the program consumes it using the library. Additionally, although the initial report shows a crash due to invalid memory access (A:H), other undefined issues that can present data integrity due to the application overwriting sensitive data are not discarded (I:H).",
          "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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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-49796",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-49796"
        }
      ],
      "release_date": "2025-06-11T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-10-27T17:46:24+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.\n\nThe References section of this erratum contains a download link. You must be logged in to download the update.",
          "product_ids": [
            "Red Hat JBoss Core Services 2.4.62.SP2"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:19020"
        },
        {
          "category": "workaround",
          "details": "There\u0027s no available mitigation other than to avoid processing untrusted XML documents if the user is unable/unwilling to update the library.",
          "product_ids": [
            "Red Hat JBoss Core Services 2.4.62.SP2"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat JBoss Core Services 2.4.62.SP2"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "libxml: Type confusion leads to Denial of service (DoS)"
    },
    {
      "cve": "CVE-2025-59375",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2025-09-15T03:00:59.775098+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2395108"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A memory amplification vulnerability in libexpat allows attackers to trigger excessive dynamic memory allocations by submitting specially crafted XML input. A small input (~250 KiB) can cause the parser to allocate hundreds of megabytes, leading to denial-of-service (DoS) through memory exhaustion.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue is Important rather than Critical because, while it allows for significant resource exhaustion leading to denial-of-service (DoS), it does not enable arbitrary code execution, data leakage, or privilege escalation. The vulnerability stems from an uncontrolled memory amplification behavior in libexpat\u2019s parser, where a relatively small XML payload can cause disproportionately large heap allocations. However, the flaw is limited in scope to service disruption and requires the attacker to submit a crafted XML document\u2014something that can be mitigated with proper input validation and memory usage limits. Therefore, while the exploitability is high, the impact is confined to availability, not confidentiality or integrity, making it a high-severity but not critical flaw.\n\nIn Firefox and Thunderbird, where libexpat is a transitive userspace dependency, exploitation usually just crashes the application (app-level DoS), so it is classify as Moderate instead of Important.",
          "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": {
        "fixed": [
          "Red Hat JBoss Core Services 2.4.62.SP2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-59375"
        },
        {
          "category": "external",
          "summary": "RHBZ#2395108",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395108"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-59375",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-59375"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-59375",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-59375"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/blob/676a4c531ec768732fac215da9730b5f50fbd2bf/expat/Changes#L45-L74",
          "url": "https://github.com/libexpat/libexpat/blob/676a4c531ec768732fac215da9730b5f50fbd2bf/expat/Changes#L45-L74"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/issues/1018",
          "url": "https://github.com/libexpat/libexpat/issues/1018"
        },
        {
          "category": "external",
          "summary": "https://github.com/libexpat/libexpat/pull/1034",
          "url": "https://github.com/libexpat/libexpat/pull/1034"
        },
        {
          "category": "external",
          "summary": "https://issues.oss-fuzz.com/issues/439133977",
          "url": "https://issues.oss-fuzz.com/issues/439133977"
        }
      ],
      "release_date": "2025-09-15T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-10-27T17:46:24+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.\n\nThe References section of this erratum contains a download link. You must be logged in to download the update.",
          "product_ids": [
            "Red Hat JBoss Core Services 2.4.62.SP2"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:19020"
        },
        {
          "category": "workaround",
          "details": "To mitigate the issue, limit XML input size and complexity before parsing, and avoid accepting compressed or deeply nested XML. Use OS-level resource controls (like ulimit or setrlimit()) to cap memory usage, or run the parser in a sandboxed or isolated process with strict memory and CPU limits. This helps prevent denial-of-service by containing excessive resource consumption.",
          "product_ids": [
            "Red Hat JBoss Core Services 2.4.62.SP2"
          ]
        }
      ],
      "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"
          },
          "products": [
            "Red Hat JBoss Core Services 2.4.62.SP2"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing"
    }
  ]
}


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