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

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
bzip2 bzip2 unaffected
Version Status Constraints
0 affected ≤ 1.0.8
35d122a3df8b0cc4082a4d89fdc6ee99f375fe67 unaffected —

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://cert.pl/en/posts/2026/05/CVE-2026-42250/ cve-icon cve-icon
https://sourceware.org/bzip2/ cve-icon cve-icon
History

Thu, 28 May 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 28 May 2026 14:15:00 +0000

Type Values Removed Values Added
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 version 1.0.9
Title Off-by-One Leading to Out-of-Bounds Write in bzip2
Weaknesses CWE-787
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: CERT-PL

Published:

Updated: 2026-05-28T17:01:57.259Z

Reserved: 2026-04-25T11:31:56.229Z

Link: CVE-2026-42250

cve-icon Vulnrichment

Updated: 2026-05-28T14:22:56.254Z

cve-icon NVD

Status : Received

Published: 2026-05-28T14:16:19.890

Modified: 2026-05-28T14:16:19.890

Link: CVE-2026-42250

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-28T15:45:19Z

Weaknesses