CVSS 4.0
1.7 lowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:UCVE-2026-34743
Low (1.7) in tukaani xz. EPSS 0.5% chance of exploitation in the next 30 days.
XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.
Severity
CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-31)
- CWE
- CWE-122
- Published
- Modified
- Record from
- the NVD, synced
Affected
- tukaani:xz
References
- https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87
- https://github.com/tukaani-project/xz/releases/tag/v5.8.3
- https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv
- http://www.openwall.com/lists/oss-security/2026/03/31/13
- https://lists.debian.org/debian-lts-announce/2026/07/msg00034.html