{
  "document": {
    "aggregate_severity": {
      "text": "Medium"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/vex/2026/cve-2026-56289-els_os-debian11els.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-09-11T18:08:10Z",
      "generator": {
        "date": "2026-09-11T18:08:10Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2026-56289-ELS_OS-DEBIAN11ELS",
      "initial_release_date": "2026-07-09T11:16:00Z",
      "revision_history": [
        {
          "date": "2026-07-09T11:16:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-09-11T18:08:10Z",
          "number": "2",
          "summary": "Official Publication"
        }
      ],
      "status": "final",
      "version": "2"
    },
    "title": "Security update on CVE-2026-56289"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Debian 11",
                "product": {
                  "name": "Debian 11",
                  "product_id": "Debian-11",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:debian:debian_linux:11:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Debian"
          },
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                "name": "patch-0:2.7.6-7.armel",
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                  "product_id": "patch-0:2.7.6-7.armel",
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                    "purl": "pkg:deb/debian/patch@2.7.6-7?arch=armel"
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          },
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                  "product_id": "patch-0:2.7.6-7.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/debian/patch@2.7.6-7?arch=amd64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "amd64"
          }
        ],
        "category": "vendor",
        "name": "Software in the Public Interest, Inc."
      },
      {
        "branches": [
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            "branches": [
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                "category": "product_version",
                "name": "patch-0:2.7.6-7+tuxcare.els1.armel",
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                "product": {
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                  "product_id": "patch-0:2.7.6-7+tuxcare.els1.arm64",
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          },
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                "name": "patch-0:2.7.6-7+tuxcare.els1.amd64",
                "product": {
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                  "product_id": "patch-0:2.7.6-7+tuxcare.els1.amd64",
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                  }
                }
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            ],
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            "name": "amd64"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "patch-0:2.7.6-7+tuxcare.els1.armel as a component of Debian 11",
          "product_id": "Debian-11:patch-0:2.7.6-7+tuxcare.els1.armel"
        },
        "product_reference": "patch-0:2.7.6-7+tuxcare.els1.armel",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "patch-0:2.7.6-7.armel as a component of Debian 11",
          "product_id": "Debian-11:patch-0:2.7.6-7.armel"
        },
        "product_reference": "patch-0:2.7.6-7.armel",
        "relates_to_product_reference": "Debian-11"
      },
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        "full_product_name": {
          "name": "patch-0:2.7.6-7+tuxcare.els1.arm64 as a component of Debian 11",
          "product_id": "Debian-11:patch-0:2.7.6-7+tuxcare.els1.arm64"
        },
        "product_reference": "patch-0:2.7.6-7+tuxcare.els1.arm64",
        "relates_to_product_reference": "Debian-11"
      },
      {
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        "full_product_name": {
          "name": "patch-0:2.7.6-7.arm64 as a component of Debian 11",
          "product_id": "Debian-11:patch-0:2.7.6-7.arm64"
        },
        "product_reference": "patch-0:2.7.6-7.arm64",
        "relates_to_product_reference": "Debian-11"
      },
      {
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        "full_product_name": {
          "name": "patch-0:2.7.6-7+tuxcare.els1.amd64 as a component of Debian 11",
          "product_id": "Debian-11:patch-0:2.7.6-7+tuxcare.els1.amd64"
        },
        "product_reference": "patch-0:2.7.6-7+tuxcare.els1.amd64",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "patch-0:2.7.6-7.amd64 as a component of Debian 11",
          "product_id": "Debian-11:patch-0:2.7.6-7.amd64"
        },
        "product_reference": "patch-0:2.7.6-7.amd64",
        "relates_to_product_reference": "Debian-11"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-56289",
      "cwe": {
        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition ('Infinite Loop')"
      },
      "notes": [
        {
          "category": "description",
          "text": "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",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
          "Debian-11:patch-0:2.7.6-7+tuxcare.els1.amd64",
          "Debian-11:patch-0:2.7.6-7+tuxcare.els1.arm64",
          "Debian-11:patch-0:2.7.6-7+tuxcare.els1.armel",
          "Debian-11:patch-0:2.7.6-7.amd64",
          "Debian-11:patch-0:2.7.6-7.arm64",
          "Debian-11:patch-0:2.7.6-7.armel"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-56289"
        },
        {
          "category": "external",
          "summary": "https://cert.pl/en/posts/2026/07/CVE-2026-56288",
          "url": "https://cert.pl/en/posts/2026/07/CVE-2026-56288"
        },
        {
          "category": "external",
          "summary": "https://cgit.git.savannah.gnu.org/cgit/patch.git/",
          "url": "https://cgit.git.savannah.gnu.org/cgit/patch.git/"
        },
        {
          "category": "external",
          "summary": "https://cgit.git.savannah.gnu.org/cgit/patch.git/commit/?id=faba04ef4f2b410257f76c1b9dc85e350929c4b9",
          "url": "https://cgit.git.savannah.gnu.org/cgit/patch.git/commit/?id=faba04ef4f2b410257f76c1b9dc85e350929c4b9"
        }
      ],
      "release_date": "2026-07-09T11:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-09-07T14:39:40.529627Z",
          "details": "CVE-2026-56289 is a local, input-driven DoS in the standalone GNU patch utility: exploitation requires executing patch on an attacker-crafted unified-diff, and it has no confidentiality or integrity impact. The utility is not network-exposed, and the effect is limited to high CPU usage by the patch process on the host where it runs, which can be terminated without broader system compromise. In enterprise server/VM contexts where patch is invoked within controlled build or maintenance workflows using known diffs, the realistic attack surface is narrow, so this issue can be safely deprioritized.",
          "product_ids": [
            "Debian-11:patch-0:2.7.6-7+tuxcare.els1.amd64",
            "Debian-11:patch-0:2.7.6-7+tuxcare.els1.arm64",
            "Debian-11:patch-0:2.7.6-7+tuxcare.els1.armel",
            "Debian-11:patch-0:2.7.6-7.amd64",
            "Debian-11:patch-0:2.7.6-7.arm64",
            "Debian-11:patch-0:2.7.6-7.armel"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Debian-11:patch-0:2.7.6-7+tuxcare.els1.amd64",
            "Debian-11:patch-0:2.7.6-7+tuxcare.els1.arm64",
            "Debian-11:patch-0:2.7.6-7+tuxcare.els1.armel",
            "Debian-11:patch-0:2.7.6-7.amd64",
            "Debian-11:patch-0:2.7.6-7.arm64",
            "Debian-11:patch-0:2.7.6-7.armel"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}