CVE-2026-42250

Off-by-One Leading to Out-of-Bounds Write in bzip2

State: Published
Severity: 4.8 Medium
Published: May 28, 2026
Updated: Jun 5, 2026
Reserved: Apr 25, 2026

Description

bzip2 contains an off‑by‑one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out‑of‑bounds write to a global buffer, resulting in memory corruption and a crash (denial of service).

This issue was fixed in bzip2 patch 35d122a3df8b0cc4082a4d89fdc6ee99f375fe67

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	CERT-PL

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
bzip2bzip2	1.0.8 and earlierAffected 35d122a3df8b0cc4082a4d89fdc6ee99f375fe67Not affected

References

https://cert.pl/en/posts/2026/05/CVE-2026-42250/third-party-advisory
https://sourceware.org/bzip2/product
https://inbox.sourceware.org/bzip2-devel/20260528145407.293768-1-mark@klomp.org/vendor-advisory
https://sourceware.org/cgit/bzip2/commit/?id=35d122a3df8b0cc4082a4d89fdc6ee99f375fe67patch

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