PT-2026-56775 · Gnu · Patch

Marcin Wyczechowski + 1 · Published 2026-07-09 · Updated 2026-07-09 · CVE-2026-56288

NVD

CVSS v4.0

4.6

Medium

Base vector

AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-56288

Affected Products

Patch

References · 4

• https://cgit.git.savannah.gnu.org/cgit/patch.git/commit/?id=e6d6a4e021660679d7fc9150f981d4920f722313 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-56288 · Security Note
• https://cgit.git.savannah.gnu.org/cgit/patch.git · Note
• https://cert.pl/en/posts/2026/07/CVE-2026-56288 · Note