What’s Vulnerable › Vulnerabilities

CVE-2026-42250: Off-by-One Leading to Out-of-Bounds Write in bzip2

• Severity: medium (CVSS 4.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-28 · updated 2026-06-17
• Weakness: CWE-787

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

Affected products

• bzip2: through 1.0.8

References

• https://cert.pl/en/posts/2026/05/CVE-2026-42250/
• https://inbox.sourceware.org/bzip2-devel/20260528145407.293768-1-mark@klomp.org/
• https://sourceware.org/bzip2/
• https://sourceware.org/cgit/bzip2/commit/?id=35d122a3df8b0cc4082a4d89fdc6ee99f375fe67

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