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CVE-2026-56288— NULL Pointer Dereference in GNU patch

Quick assessment

Affected
GNU patch
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GNU patch是美国GNU基金会开源的一个应用补丁修正程序。 GNU patch 2.8.0及之前版本存在异常处理不当漏洞，该漏洞源于处理特制的统一差异补丁文件时空指针取消引用，对连续文件结束换行标记处理不当可能破坏内部数据块数据结构，导致处理过程中向fwrite传递空指针，攻击者利用恶意补丁文件触发此条件，导致程序崩溃并拒绝服务。

AI Predicted 5.5 Difficulty: Easy EPSS 0.17% · P5

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU patch ≤ 2.8.0 affected
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I. Basic Information for CVE-2026-56288

Vulnerability Information
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Vulnerability Title
NULL Pointer Dereference in GNU patch
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
GNU patch 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU patch是美国GNU基金会开源的一个应用补丁修正程序。 GNU patch 2.8.0及之前版本存在异常处理不当漏洞，该漏洞源于处理特制的统一差异补丁文件时空指针取消引用，对连续文件结束换行标记处理不当可能破坏内部数据块数据结构，导致处理过程中向fwrite传递空指针，攻击者利用恶意补丁文件触发此条件，导致程序崩溃并拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNU patch 0 ~ 2.8.0 -

II. Public POCs for CVE-2026-56288

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III. Intelligence Information for CVE-2026-56288

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Patches & Fixes for CVE-2026-56288 (2)

Security Blog Posts for CVE-2026-56288 (1)

Same Patch Batch · GNU · 2026-07-09 · 4 CVEs total

CVE-2026-15182 5.3 MEDIUM GNU LibreDWG BMP Image dwg.c dwg_bmp heap-based overflow
CVE-2026-15184 3.3 LOW GNU LibreDWG DWG File dwg.c dwg_next_entity null pointer dereference
CVE-2026-56289 Loop with Unreachable Exit Condition in GNU patch

IV. Related Vulnerabilities

Same product: patch
Same vendor: GNU
Same weakness: CWE-476

V. Comments for CVE-2026-56288

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