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CVE-2025-31115

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

Published: Apr 3, 2025Updated: May 12, 2026 Sources: CVE List NVD BDU csafCWE-366
7.5HIGH
NVD MITRE
EPSS Score
0.6%
Top 52.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LC:NI:NA:H
Exploitability
AV:NAccess Vector
Network
AC:LAccess Complexity
Low
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
H
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Weaknesses

CWE-366CWE-416CWE-476CWE-826

Affected Products

ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
Astra Linux Special EditionOn-premOS
Operating Systems / linux-distro
Сообщество свободного программного обеспечения
oss-projectaka fsf
XZ UtilsLibraryLibrary
OSS Libraries / generic-library
АО «НППКТ»
commercial·RU
ОСОН ОСнова ОnyxOn-premOS
Operating Systems / linux-distro
tukaani-project
oss-project·FIaka tukaani project, tukaani
xzLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques
Impact
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/tukaani-project/xz/commit/d5a2ffe41bb77b918a8c96084885d4dbe4bf6480
github.com
https://github.com/tukaani-project/xz/security/advisories/GHSA-6cc8-p5mm-29w2
github.com
https://tukaani.org/xz/xz-cve-2025-31115.patch
tukaani.org
and 27 more references View all →

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