Vulnerability-Lookup

GHSA-3M3R-F94V-4MF8

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

Details

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

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:L

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-56289"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-09T11:16:40Z",
    "severity": "MODERATE"
  },
  "details": "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.\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",
  "id": "GHSA-3m3r-f94v-4mf8",
  "modified": "2026-07-09T12:30:28Z",
  "published": "2026-07-09T12:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56289"
    },
    {
      "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=faba04ef4f2b410257f76c1b9dc85e350929c4b9"
    }
  ],
  "schema_version": "1.4.0",
  "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:L/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"
    }
  ]
}

CVE-2026-56289 (GCVE-0-2026-56289)

Vulnerability from cvelistv5 – Published: 2026-07-09 09:29 – Updated: 2026-07-09 12:21 X_Open Source

Title

Loop with Unreachable Exit Condition in GNU patch

Summary

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:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

CERT-PL

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
GNU	patch	Affected: 0 , ≤ 2.8.0 (semver)

Credits

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

Show details on NVD website

JSON

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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-56289",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-09T12:20:43.274659Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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        },
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        }
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}

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.

Action not permitted

GHSA-3M3R-F94V-4MF8

CVE-2026-56289 (GCVE-0-2026-56289)

Tags

Sightings

Nomenclature