CVE-2026-34743
XZ Utils: Buffer overflow in lzma_index_append()
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-122 |
| Vendor | tukaani-project |
| Product | xz |
| Published | Apr 2, 2026 |
| Last Updated | Apr 3, 2026 |
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Affected Versions
tukaani-project / xz
< 5.8.3
References
github.com: https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv github.com: https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87 github.com: https://github.com/tukaani-project/xz/releases/tag/v5.8.3 openwall.com: http://www.openwall.com/lists/oss-security/2026/03/31/13