CVE-2025-31115
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 5.8.1-1 | |
| sles | affected | | |
| debian | bookworm | fixed | 5.4.1-1 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 5.8.1-1 |
| debian | sid | fixed | 5.8.1-1 |
| debian | trixie | fixed | 5.8.1-1 |
References
- https://github.com/tukaani-project/xz/commit/d5a2ffe41bb77b918a8c96084885d4dbe4bf6480
- https://github.com/tukaani-project/xz/security/advisories/GHSA-6cc8-p5mm-29w2
- https://tukaani.org/xz/xz-cve-2025-31115.patch
- http://www.openwall.com/lists/oss-security/2025/04/03/1
- http://www.openwall.com/lists/oss-security/2025/04/03/2
- http://www.openwall.com/lists/oss-security/2025/04/03/3
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://www.suse.com/security/cve/CVE-2025-31115.html
- https://security-tracker.debian.org/tracker/CVE-2025-31115
CWEs
CWE-366 CWE-416 CWE-476 CWE-826
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.