patch — security advisory

{
  "id": "4accc86f30b87a62ebb31bdc5a8d0f46fe3880bf710fa64d507bc87822050f8f",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-56288",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-56288",
    "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",
    "evidence": "osv:DEBIAN-CVE-2026-56288",
    "products": [
      {
        "name": {
          "value": "patch",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.7.6-7",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.8-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.8-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.8.1-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "patch",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.8-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.8.1-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "patch",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.8-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.8.1-1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-56288",
      "aliases": [
        "DEBIAN-CVE-2026-56288"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "patch",
            "purl": "pkg:deb/debian/patch?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "2.7.6-7",
            "2.8-1",
            "2.8-2",
            "2.8.1-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56288.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "patch",
            "purl": "pkg:deb/debian/patch?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "2.8-2",
            "2.8.1-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56288.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "patch",
            "purl": "pkg:deb/debian/patch?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "2.8-2",
            "2.8.1-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56288.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        }
      ],
      "modified": "2026-10-26T12:02:37.083193129Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-56288"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-56288"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-56288",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 452567,
  "published_at": "2026-07-09T11:16:40.713+00:00"
}