Bug 2498462 (CVE-2026-56289) - CVE-2026-56289 patch: GNU patch: Denial of Service via crafted unified-diff input
Summary: CVE-2026-56289 patch: GNU patch: Denial of Service via crafted unified-diff i...
Keywords:
Status: NEW
Alias: CVE-2026-56289
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-09 11:01 UTC by OSIDB Bzimport
Modified: 2026-10-16 10:04 UTC (History)
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Description OSIDB Bzimport 2026-07-09 11:01:12 UTC 
GNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of changes in diff) line offsets in unified-diff input. A specially crafted patch can specify an extremely large line number, causing the application to enter an effectively infinite processing loop while attempting to locate the requested position.
This results in excessive CPU consumption and prevents the process from completing.
An attacker can trigger this behavior by supplying a malicious patch file, causing the utility to become unresponsive and require manual termination.



This issue has been fixed in the commit faba04ef4f2b410257f76c1b9dc85e350929c4b9
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