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    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

    Published:Jul 9, 2026
    Last Modified:Jul 9, 2026
    EPS:Jul 9, 2026
    EPSS Score:
    CVSS Score:4.6

    Affected Products

    Vendor
    Gnu
    Product
    Patch

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-56289 (CVSS 4.6) — GNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of chang…
    CVE-2021-45261 (CVSS 5.5) — An Invalid Pointer vulnerability exists in GNU patch 2.7 via the another_hunk function, which causes a Denial …
    CVE-2018-20969 (CVSS 7.8) — do_ed_script in pch.c in GNU patch through 2.7.6 does not block strings beginning with a ! character. NOTE: th…
    CVE-2019-20633 (CVSS 5.5) — GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk …
    CVE-2019-13638 (CVSS 7.8) — GNU patch through 2.7.6 is vulnerable to OS shell command injection that can be exploited by opening a crafted…
    CVE-2019-13636 (CVSS 5.9) — In GNU patch through 2.7.6, the following of symlinks is mishandled in certain cases other than input files. T…
    CVE-2018-1000156 (CVSS 7.8) — GNU Patch version 2.7.6 contains an input validation vulnerability when processing patch files, specifically t…
    CVE-2016-10713 (CVSS 5.5) — An issue was discovered in GNU patch before 2.7.6. Out-of-bounds access within pch_write_line() in pch.c can p…
    CVE-2018-6952 (CVSS 7.5) — A double free exists in the another_hunk function in pch.c in GNU patch through 2.7.6.…
    CVE-2018-6951 (CVSS 7.5) — An issue was discovered in GNU patch through 2.7.6. There is a segmentation fault, associated with a NULL poin…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High