Vulnerability-Lookup

CVE-2026-56288 (GCVE-0-2026-56288)

Vulnerability from cvelistv5 – Published: 2026-07-09 09:29 – Updated: 2026-07-09 12:57 X_Open Source

Title

NULL Pointer Dereference in GNU patch

Summary

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

Severity

4.6 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-09 12:57 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

CERT-PL ENISA root

References

3 references

URL	Tags
https://cert.pl/en/posts/2026/07/CVE-2026-56288	third-party-advisory
https://cgit.git.savannah.gnu.org/cgit/patch.git/	product
https://cgit.git.savannah.gnu.org/cgit/patch.git/…	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
GNU	patch	Affected: 0 , ≤ 2.8.0 (semver)	guessed

Credits

Michał Majchrowicz (AFINE Team) Marcin Wyczechowski (AFINE Team)

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-56288

Vulnerability from fkie_nvd - Published: 2026-07-09 11:16 - Updated: 2026-07-13 14:08

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

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

Impacted products

	Vendor	Product	Version
	gnu	patch	*

JSON

To clipboard

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GHSA-M3J2-9M66-R96H

Vulnerability from github – Published: 2026-07-09 12:30 – Updated: 2026-07-13 15:31

Details

This issue has been fixed in the commit e6d6a4e021660679d7fc9150f981d4920f722313

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

4.6 (Medium)


                  
                    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

Show details on source website

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To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-56288"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-09T11:16:40Z",
    "severity": "MODERATE"
  },
  "details": "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.\nAn attacker can trigger this condition with a malicious patch file, causing the utility to crash and resulting in a denial of service.\n\n\n\nThis issue has been fixed in the commit e6d6a4e021660679d7fc9150f981d4920f722313",
  "id": "GHSA-m3j2-9m66-r96h",
  "modified": "2026-07-13T15:31:42Z",
  "published": "2026-07-09T12:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56288"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/07/CVE-2026-56288"
    },
    {
      "type": "WEB",
      "url": "https://cgit.git.savannah.gnu.org/cgit/patch.git"
    },
    {
      "type": "WEB",
      "url": "https://cgit.git.savannah.gnu.org/cgit/patch.git/commit/?id=e6d6a4e021660679d7fc9150f981d4920f722313"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/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",
      "type": "CVSS_V4"
    }
  ]
}

MSRC_CVE-2026-56288

Vulnerability from csaf_microsoft - Published: 2026-07-10 01:01 - Updated: 2026-07-15 01:40

Summary

NULL Pointer Dereference in GNU patch

Scope

1 vulnerability in this advisory, including CVE-2026-56288.

CVE-2026-56288

Fixed: 1 product Known affected: 2 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OESA-2026-3056 (CVE-2026-56288)

Vulnerability from osv_openeuler – Published: 2026-07-19 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

patch security update

Details

Patch takes a patch file containing a difference listing produced by the diff program and applies those differences to one or more original files, producing patched versions.

Security Fix(es):

This issue has been fixed in the commit e6d6a4e021660679d7fc9150f981d4920f722313(CVE-2026-56288)

GNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of changes in diff) line offsets in unified-diff input. A specially crafted patch can specify an extremely large line number, causing the application to enter an effectively infinite processing loop while attempting to locate the requested position. This results in excessive CPU consumption and prevents the process from completing. An attacker can trigger this behavior by supplying a malicious patch file, causing the utility to become unresponsive and require manual termination.

This issue has been fixed in the commit faba04ef4f2b410257f76c1b9dc85e350929c4b9(CVE-2026-56289)

Severity

4.6 (Medium)


                    
                      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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-56288	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-56289	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "patch-2.7.6-23.oe2403sp3.aarch64.rpm",
          "patch-debuginfo-2.7.6-23.oe2403sp3.aarch64.rpm",
          "patch-debugsource-2.7.6-23.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "patch-help-2.7.6-23.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "patch-2.7.6-23.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "patch-2.7.6-23.oe2403sp3.x86_64.rpm",
          "patch-debuginfo-2.7.6-23.oe2403sp3.x86_64.rpm",
          "patch-debugsource-2.7.6-23.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "patch",
        "purl": "pkg:rpm/openEuler/patch\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.7.6-23.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "patch-2.7.6-23.oe2403sp4.aarch64.rpm",
          "patch-debuginfo-2.7.6-23.oe2403sp4.aarch64.rpm",
          "patch-debugsource-2.7.6-23.oe2403sp4.aarch64.rpm"
        ],
        "noarch": [
          "patch-help-2.7.6-23.oe2403sp4.noarch.rpm"
        ],
        "src": [
          "patch-2.7.6-23.oe2403sp4.src.rpm"
        ],
        "x86_64": [
          "patch-2.7.6-23.oe2403sp4.x86_64.rpm",
          "patch-debuginfo-2.7.6-23.oe2403sp4.x86_64.rpm",
          "patch-debugsource-2.7.6-23.oe2403sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP4",
        "name": "patch",
        "purl": "pkg:rpm/openEuler/patch\u0026distro=openEuler-24.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.7.6-23.oe2403sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "patch-2.7.6-16.oe2003sp4.aarch64.rpm",
          "patch-debuginfo-2.7.6-16.oe2003sp4.aarch64.rpm",
          "patch-debugsource-2.7.6-16.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "patch-help-2.7.6-16.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "patch-2.7.6-16.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "patch-2.7.6-16.oe2003sp4.x86_64.rpm",
          "patch-debuginfo-2.7.6-16.oe2003sp4.x86_64.rpm",
          "patch-debugsource-2.7.6-16.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "patch",
        "purl": "pkg:rpm/openEuler/patch\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.7.6-16.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "patch-2.7.6-16.oe2203sp4.aarch64.rpm",
          "patch-debuginfo-2.7.6-16.oe2203sp4.aarch64.rpm",
          "patch-debugsource-2.7.6-16.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "patch-help-2.7.6-16.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "patch-2.7.6-16.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "patch-2.7.6-16.oe2203sp4.x86_64.rpm",
          "patch-debuginfo-2.7.6-16.oe2203sp4.x86_64.rpm",
          "patch-debugsource-2.7.6-16.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "patch",
        "purl": "pkg:rpm/openEuler/patch\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.7.6-16.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "patch-2.7.6-23.oe2403sp1.aarch64.rpm",
          "patch-debuginfo-2.7.6-23.oe2403sp1.aarch64.rpm",
          "patch-debugsource-2.7.6-23.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "patch-help-2.7.6-23.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "patch-2.7.6-23.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "patch-2.7.6-23.oe2403sp1.x86_64.rpm",
          "patch-debuginfo-2.7.6-23.oe2403sp1.x86_64.rpm",
          "patch-debugsource-2.7.6-23.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "patch",
        "purl": "pkg:rpm/openEuler/patch\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.7.6-23.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Patch takes a patch file containing a difference listing produced by the diff program and applies those differences to one or more original files, producing patched versions.\r\n\r\nSecurity Fix(es):\n\nGNU 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.\nAn attacker can trigger this condition with a malicious patch file, causing the utility to crash and resulting in a denial of service.\n\n\n\nThis issue has been fixed in the commit e6d6a4e021660679d7fc9150f981d4920f722313(CVE-2026-56288)\n\nGNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of changes in diff) line offsets in unified-diff input. A specially crafted patch can specify an extremely large line number, causing the application to enter an effectively infinite processing loop while attempting to locate the requested position.\nThis results in excessive CPU consumption and prevents the process from completing.\nAn attacker can trigger this behavior by supplying a malicious patch file, causing the utility to become unresponsive and require manual termination.\n\n\n\nThis issue has been fixed in the commit faba04ef4f2b410257f76c1b9dc85e350929c4b9(CVE-2026-56289)",
  "id": "OESA-2026-3056",
  "modified": "2026-08-06T11:11:56Z",
  "published": "2026-07-19T11:11:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3056"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56288"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56289"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "patch security update",
  "upstream": [
    "CVE-2026-56288",
    "CVE-2026-56289"
  ]
}

OPENSUSE-SU-2026:11260-1

Vulnerability from csaf_opensuse - Published: 2026-07-12 00:00 - Updated: 2026-09-17 17:14

Summary

patch-2.8-3.1 on GA media

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2026-56288.

CVE-2026-56288

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Recommended: 4 products

Open the full advisory

OPENSUSE-SU-2026:21332-1

Vulnerability from csaf_opensuse - Published: 2026-07-13 19:26 - Updated: 2026-09-17 17:38

Summary

Security update for patch

Severity

Low

Scope

2 vulnerabilities in this advisory, including CVE-2026-56288.

CVE-2026-56288

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Recommended: 4 products

Open the full advisory

RHSA-2026:38019

Vulnerability from csaf_redhat - Published: 2026-07-10 19:12 - Updated: 2026-09-08 01:57

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-56288.

CVE-2026-56288

A flaw was found in GNU patch. An attacker can exploit this by providing a specially crafted patch file, which leads to a NULL pointer dereference. This improper handling of end-of-file markers can corrupt internal data structures, causing the utility to crash. This results in a denial of service (DoS) for the affected system.

5.0 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:38019

Open the full advisory

SUSE-SU-2026:22604-1

Vulnerability from csaf_suse - Published: 2026-07-13 19:27 - Updated: 2026-09-16 20:03

Summary

Security update for patch

Severity

Low

Scope

2 vulnerabilities in this advisory, including CVE-2026-56288.

CVE-2026-56288

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Recommended: 4 products

Open the full advisory

SUSE-SU-2026:22651-1

Vulnerability from csaf_suse - Published: 2026-07-13 19:27 - Updated: 2026-09-16 20:03

Summary

Security update for patch

Severity

Low

Scope

2 vulnerabilities in this advisory, including CVE-2026-56288.

CVE-2026-56288

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Recommended: 8 products

Open the full advisory

SUSE-SU-2026:22905-1

Vulnerability from csaf_suse - Published: 2026-07-23 11:27 - Updated: 2026-09-16 20:07

Summary

Security update for patch

Severity

Low

Scope

3 vulnerabilities in this advisory, including CVE-2026-56288.

CVE-2026-56288

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Recommended: 4 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-56288 (GCVE-0-2026-56288)

OESA-2026-3056 (CVE-2026-56288)

Tags

Sightings

Nomenclature

Related by attack behaviour