Buffer overflow in Tukaani-project Xz

CVE-2026-34743

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…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (19.0th percentile) — read the EPSS interpretation.

Affected products

Tukaani-project Xz — versions < 5.8.3

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

https://github.com/tukaani-project/xz/security/advisories/GHSA-x872-m794-cxhv (x_refsource_CONFIRM)
https://github.com/tukaani-project/xz/commit/c8c22869e780ff57c96b46939c3d79ff99395f87 (x_refsource_MISC)
https://github.com/tukaani-project/xz/releases/tag/v5.8.3 (x_refsource_MISC)