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

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://cert.pl/en/posts/2026/07/CVE-2026-56288	Third Party Advisory
https://cgit.git.savannah.gnu.org/cgit/patch.git/	Patch Product
https://cgit.git.savannah.gnu.org/cgit/patch.git/commit/?id=e6d6a4e021660679d7fc9150f981d4920f722313	Patch

Configurations

Configuration 1 (hide)

cpe:2.3:a:gnu:patch:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-09 11:16

Updated : 2026-07-13 14:08

NVD link : CVE-2026-56288

Mitre link : CVE-2026-56288

CVE.ORG link : CVE-2026-56288

JSON object : View

Products Affected

gnu

patch

CWE

CWE-476

NULL Pointer Dereference

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