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Vulnerable Software

Vulnerability Details CVE-2026-56288

GNU patch is vulnerable to a NULL pointer dereference when processing a specially crafted unified-diff patch file. Improper handling of consecutive end-of-file newline markers can corrupt internal hunk (single block of changes in diff) data structures, causing the application to pass a NULL pointer to fwrite() during patch processing. An attacker can trigger this condition with a malicious patch file, causing the utility to crash and resulting in a denial of service. This issue has been fixed in the commit e6d6a4e021660679d7fc9150f981d4920f722313
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 2.6%
CVSS Severity
CVSS v3 Score 5.5
Products affected by CVE-2026-56288
  • Gnu » Patch » Version: 2.5
    cpe:2.3:a:gnu:patch:2.5
  • Gnu » Patch » Version: 2.5.4
    cpe:2.3:a:gnu:patch:2.5.4
  • Gnu » Patch » Version: 2.5.9
    cpe:2.3:a:gnu:patch:2.5.9
  • Gnu » Patch » Version: 2.6
    cpe:2.3:a:gnu:patch:2.6
  • Gnu » Patch » Version: 2.6.1
    cpe:2.3:a:gnu:patch:2.6.1
  • Gnu » Patch » Version: 2.7
    cpe:2.3:a:gnu:patch:2.7
  • Gnu » Patch » Version: 2.7.1
    cpe:2.3:a:gnu:patch:2.7.1
  • Gnu » Patch » Version: 2.7.2
    cpe:2.3:a:gnu:patch:2.7.2
  • Gnu » Patch » Version: 2.7.3
    cpe:2.3:a:gnu:patch:2.7.3
  • Gnu » Patch » Version: 2.7.4
    cpe:2.3:a:gnu:patch:2.7.4
  • Gnu » Patch » Version: 2.7.5
    cpe:2.3:a:gnu:patch:2.7.5
  • Gnu » Patch » Version: 2.7.6
    cpe:2.3:a:gnu:patch:2.7.6


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