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CVE-2026-42250

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

MEDIUM
4.8
CVSS Score
Published: May 28, 2026 at 01:15 PM UTC
Updated: June 17, 2026 at 10:47 AM UTC
1 product affected across 1 vendorBZIP2

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

BZIP2· BZIP2
60%
v ≤ 1.0.8
Vendor states this is fixed in 35d122a3df8b0cc4082a4d89fdc6ee99f375fe67 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Third Party Advisory
Source: cverecord
https://cert.pl/en/posts/2026/05/CVE-2026-42250/
Product
Source: cverecord
https://sourceware.org/bzip2/
Vendor Advisory
Source: cverecord
https://inbox.sourceware.org/bzip2-devel/[email protected]/
Patch
Source: cverecord
https://sourceware.org/cgit/bzip2/commit/?id=35d122a3df8b0cc4082a4d89fdc6ee99f375fe67

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMCERT-PL
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-787

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