XZ Utils provide a general-purpose data-compression library plus command-line tools. In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in liblzma has a bug where invalid input can at least result in a crash. The effects include heap use after free and writing to an address based on the null pointer plus an offset. Applications and libraries that use the lzma_stream_decoder_mt function are affected. The bug has been fixed in XZ Utils 5.8.1, and the fix has been committed to the v5.4, v5.6, v5.8, and master branches in the xz Git repository. No new release packages will be made from the old stable branches, but a standalone patch is available that applies to all affected releases.

vendor_unpatched cve-2025-31115: Unpatched CVEs for Debian Linux, Ubuntu Linux (cve-2025-31115)

An update of the xz package has been released.

The remote host is affected by the vulnerability described in GLSA-202504-01 (XZ Utils: Use after free)

    A use-after-free has been discovered in XZ utils. Please review the CVE identifier referenced below for     details.

Tenable has extracted the preceding description block directly from the Gentoo Linux 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2025:1137-1 advisory.

    - CVE-2025-31115: Fixed heap use after free and writing to an address based on the null pointer plus an     offset (bsc#1240414)

Tenable has extracted the preceding description block directly from the SUSE 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 24.04 LTS / 24.10 host has packages installed that are affected by a vulnerability as referenced in the USN-7414-1 advisory.

    Harri K. Koskinen discovered that XZ Utils incorrectly handled the threaded xz decoder. If a user or     automated system were tricked into processing an xz file, a remote attacker could use this issue to cause     XZ Utils to crash, resulting in 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.

ID	Name	Product	Family	Severity
233960	Photon OS 5.0: Xz PHSA-2025-5.0-0496	Nessus	PhotonOS Local Security Checks	high
233877	GLSA-202504-01 : XZ Utils: Use after free	Nessus	Gentoo Local Security Checks	high
233842	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : xz (SUSE-SU-2025:1137-1)	Nessus	SuSE Local Security Checks	high
233831	Ubuntu 24.04 LTS / 24.10 : XZ Utils vulnerability (USN-7414-1)	Nessus	Ubuntu Local Security Checks	high

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