CVE-2025-31115

Publication date 3 April 2025

Last updated 9 April 2025

Ubuntu priority

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
xz-utils	24.10 oracular	Fixed 5.6.2-2ubuntu0.2
	24.04 LTS noble	Fixed 5.6.1+really5.4.5-1ubuntu0.2
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

per upstream, affects 5.3.3alpha to 5.8.0

References

Related Ubuntu Security Notices (USN)

USN-7414-1
XZ Utils vulnerability
3 April 2025

Other references

https://www.cve.org/CVERecord?id=CVE-2025-31115