The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4251 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4251-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     July 26, 2025                                 https://wiki.debian.org/LTS
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    Package        : libxml2     Version        : 2.9.10+dfsg-6.7+deb11u8     CVE ID         : CVE-2024-34459 CVE-2025-6021 CVE-2025-6170 CVE-2025-49794                      CVE-2025-49796     Debian Bug     : 1071162 1107720 1107755 1107938

    Multiple security issues were found in libxml2, the GNOME XML library,     which could yield to denial of service or potentially arbitrary code     execution.

    CVE-2024-34459

        Zhineng Zhong discovered that formatting error messages with `xmllint
        --htmlout` could result in a buffer over-read.

    CVE-2025-6021

        Ahmed Lekssays discovered an integer overflow issue in         `xmlBuildQName()` which could result in memory corruption or a         denial of service when processing crafted input.

    CVE-2025-6170

        Ahmed Lekssays discovered a stack-based buffer overflow issue in the         command-parsing logic of the interactive shell in xmllint.

    CVE-2025-49794

        Nikita Sveshnikov discovered a heap use-after-free issue in the         schematron.  When processing XPath expressions in Schematron schema         elements `<sch:name path=/>`, a pointer to freed memory is         returned and then accessed, leading to undefined behavior or         potential crashes.

    CVE-2025-49796

        Nikita Sveshnikov discovered a type confusion issue in the         schematron.  Processing `sch:name` elements and accessing namespace         information may lead to leading to memory corruption or undefined         behavior.

    For Debian 11 bullseye, these problems have been fixed in version     2.9.10+dfsg-6.7+deb11u8.

    We recommend that you upgrade your libxml2 packages.

    For the detailed security status of libxml2 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libxml2

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

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

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

Detections

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Debian dla-4251 : libxml2 - security update

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Version 1.2 Oct 3, 2025, 10:49 PM New Plugin Feed: 202510032249
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