Heap buffer overflow in gawk

{
  "id": "f27078b64c20861cefafb15ef2555366a10809572ec46757be429058e237bebc",
  "url": "https://osv.dev/vulnerability/CVE-2026-40468",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Heap buffer overflow in gawk",
    "summary": "Integer overflow vulnerability has been found in \"builtin.c\" program file of gawk. This issue may lead to memory exhaustion on the hosting operating system and could be used to overwrite gawk heap metadata and objects with attacker-controlled bytes. It affects gawk in versions 5.4.0 and below.",
    "evidence": "osv:CVE-2026-40468",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-40468",
      "aliases": [
        "CVE-2026-40468"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://cgit.git.savannah.gnu.org/cgit/gawk.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "062f2f2581b991362c046f7f2e238ffa34e6f8c7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "062f2f2581b991362c046f7f2e238ffa34e6f8c7"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40468.json"
          }
        }
      ],
      "modified": "2026-10-31T10:30:36.495528161Z",
      "provider": "osv",
      "references": [
        "https://cgit.git.savannah.gnu.org/cgit/gawk.git/",
        "https://cert.pl/en/posts/2026/07/CVE-2026-40467",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40468.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40468",
        "https://cgit.git.savannah.gnu.org/cgit/gawk.git/commit/?id=062f2f2581b991362c046f7f2e238ffa34e6f8c7"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-190"
        ],
        "cna_assigner": "CERT-PL",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "5.4.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "5.4.0"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40468.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40468",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 446627,
  "published_at": "2026-07-13T12:07:54.91+00:00"
}