CVE-2026-34743
XZ Utils: Buffer overflow in lzma_index_append()
- State
- Published
- Severity
- 1.7 Low
- Published
- Apr 2, 2026
- Updated
- Jul 21, 2026
- Reserved
- Mar 30, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 1.7 Low | CVSS: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:U | GitHub_M |
Weaknesses
- CWE-122 Heap-based Buffer Overflow
Affected Products
| Product | Versions |
|---|---|
xztukaani-project |
|
References
- https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv
- https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87
- https://github.com/tukaani-project/xz/releases/tag/v5.8.3
- http://www.openwall.com/lists/oss-security/2026/03/31/13
- https://lists.debian.org/debian-lts-announce/2026/07/msg00034.html
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