CVE-2025-31115

UNKNOWN 0.0

XZ has a heap-use-after-free bug in threaded .xz decoder

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-366 CWE-416 CWE-476 CWE-826
Vendor	tukaani-project
Product	xz
Published	Apr 3, 2025
Last Updated	May 12, 2026

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Affected Versions

tukaani-project / xz

>= 5.3.3alpha, < 5.8.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/tukaani-project/xz/security/advisories/GHSA-6cc8-p5mm-29w2 github.com: https://github.com/tukaani-project/xz/commit/d5a2ffe41bb77b918a8c96084885d4dbe4bf6480 tukaani.org: https://tukaani.org/xz/xz-cve-2025-31115.patch openwall.com: http://www.openwall.com/lists/oss-security/2025/04/03/1 openwall.com: http://www.openwall.com/lists/oss-security/2025/04/03/2 openwall.com: http://www.openwall.com/lists/oss-security/2025/04/03/3 cert-portal.siemens.com: https://cert-portal.siemens.com/productcert/html/ssa-082556.html