A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2025-10630 advisory.

    - Fix CVE-2025-6021 (RHEL-96495)
    - Fix CVE-2025-49794 (RHEL-96395)
    - Fix CVE-2025-49795 (RHEL-96408)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:10630 advisory.

    The libxml2 library is a development toolbox providing the implementation of various XML standards.

    Security Fix(es):

    * libxml: Heap use after free (UAF) leads to Denial of service (DoS) (CVE-2025-49794)

    * libxml: Null pointer dereference leads to Denial of service (DoS) (CVE-2025-49795)

    * libxml: Type confusion leads to Denial of service (DoS) (CVE-2025-49796)

    * libxml2: Integer Overflow in xmlBuildQName() Leads to Stack Buffer Overflow in libxml2 (CVE-2025-6021)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its self-reported version, the Tenable Nessus application running on the remote host is prior or equal to 10.8.4. It is, therefore, affected by multiple vulnerabilities as referenced in the TNS-2025-13 advisory.

  - A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations     can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of     service when processing crafted input. (CVE-2025-6021)

  - numbers.c in libxslt before 1.1.43 has a use-after-free because, in nested XPath evaluations, an XPath     context node can be modified but never restored. This is related to xsltNumberFormatGetValue,     xsltEvalXPathPredicate, xsltEvalXPathStringNs, and xsltComputeSortResultInternal. (CVE-2025-24855)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of libxml2 installed on the remote host is prior to 2.9.1-6. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2025-2893 advisory.

    A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations     can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of     service when processing crafted input. (CVE-2025-6021)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2025-1019 advisory.

    A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations     can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of     service when processing crafted input. (CVE-2025-6021)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of libxml2 installed on the remote host is prior to 2.11.9 / 2.14.4. It is, therefore, affected by a vulnerability as referenced in the SSA:2025-167-01 advisory.

    New libxml2 packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the libxml2 security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
241634	Oracle Linux 10 : libxml2 (ELSA-2025-10630)	Nessus	Oracle Linux Local Security Checks	critical
241600	RHEL 10 : libxml2 (RHSA-2025:10630)	Nessus	Red Hat Local Security Checks	critical
241370	Tenable Nessus <= 10.8.4 Multiple Vulnerabilities (TNS-2025-13)	Nessus	Misc.	high
240449	Amazon Linux 2 : libxml2 (ALAS-2025-2893)	Nessus	Amazon Linux Local Security Checks	high
240319	Amazon Linux 2023 : libxml2, libxml2-devel, libxml2-static (ALAS2023-2025-1019)	Nessus	Amazon Linux Local Security Checks	high
240078	Slackware Linux 15.0 / current libxml2 Vulnerability (SSA:2025-167-01)	Nessus	Slackware Local Security Checks	high

Detections

Analytics

CVE-2025-6021

high

Tenable Plugins

critical

critical

high

high

high

high