CVE-2025-31115

NameCVE-2025-31115
DescriptionXZ 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
xz-utils (PTS)bullseye (security), bullseye5.2.5-2.1~deb11u1fixed
bookworm5.4.1-0.2vulnerable
trixie5.6.4-1vulnerable
sid5.8.1-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
xz-utilssourcebullseye(not affected)
xz-utilssource(unstable)5.8.1-1

Notes

[bullseye] - xz-utils <not-affected> (Vulnerable code introduced later)
https://www.openwall.com/lists/oss-security/2025/04/03/1
https://tukaani.org/xz/threaded-decoder-early-free.html
https://github.com/tukaani-project/xz/security/advisories/GHSA-6cc8-p5mm-29w2

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