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Vulnerability in bzip2 software
28 May 2026 | CERT Polska | #vulnerability, #warning, #cve
CVE ID CVE-2026-42250
Publication date 28 May 2026
Vendor bzip2
Product bzip2
Vulnerable versions All before 1.0.9
Vulnerability type (CWE) Out-of-bounds Write (CWE-787)
Report source Report to CERT Polska

Description

CERT Polska has received a report about vulnerability in bzip2 software and participated in coordination of its disclosure.

The vulnerability CVE-2026-42250: 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 version 1.0.9

Credits

We thank Michał Majchrowicz and Marcin Wyczechowski from AFINE Team for the responsible vulnerability report.

More about the coordinated vulnerability disclosure process at CERT Polska can be found at https://cert.pl/en/cvd/.