Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.

amazon_alas ALAS2023-2026-1911: Amazon Linux 2023 Security Advisory:ALAS2023-2026-1911

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 ALAS2-2026-3785 advisory.

    Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a     remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity     resolution handling. (CVE-2026-6653)

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 remote Ubuntu 22.04 LTS / 24.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8456-1 advisory.

    Geoffrey Humphreys discovered that libxml2 had a use after free when parsing the internal subset of a DTD.
    A remote attacker could possibly use this issue to cause a denial of service or possibly execute arbitrary     code.

Tenable has extracted the preceding description block directly from the Ubuntu 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a     remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity     resolution handling. (CVE-2026-6653)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
325587	Amazon Linux 2 : libxml2, --advisory ALAS2-2026-3785 (ALAS-2026-3785)	Nessus	Amazon Linux Local Security Checks	high
322479	Ubuntu 22.04 LTS / 24.04 LTS : libxml2 vulnerability (USN-8456-1)	Nessus	Ubuntu Local Security Checks	high
321971	Linux Distros Unpatched Vulnerability : CVE-2026-6653	Nessus	Misc.	high

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