Security advisory

{
  "id": "62b38fd045e2387fa88fabaa57c1e440b75aa5fffcfcbec668d5f7e5ef2ee593",
  "url": "https://osv.dev/vulnerability/CVE-2020-11958",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-11958",
    "summary": "re2c 1.3 has a heap-based buffer overflow in Scanner::fill in parse/scanner.cc via a long lexeme.",
    "evidence": "osv:CVE-2020-11958",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-11958",
      "aliases": [
        "CVE-2020-11958"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/skvadrik/re2c",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e1901b71c6414c510f10f4cc30c0a05600e55ed1"
                },
                {
                  "last_affected": "e1901b71c6414c510f10f4cc30c0a05600e55ed1"
                },
                {
                  "fixed": "c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:re2c:re2c:1.3:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.3"
                      },
                      {
                        "last_affected": "1.3"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-11958.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-11958-1ed4ef83",
                "digest": {
                  "length": 689,
                  "function_hash": "333593729438856307916757536742331749380"
                },
                "source": "https://github.com/skvadrik/re2c/commit/c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776a",
                "target": {
                  "file": "src/parse/scanner.cc",
                  "function": "Scanner::fill"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-11958-ff60d1f0",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "49856157583685485338382242415855956217",
                    "62389220857190960901324283129598467832",
                    "184037409826309927940272893902015140416",
                    "273502829212453987266105187472144333968",
                    "61068454445922609334293328596814080330",
                    "171489683377489733976258294719111059476",
                    "63121316251367159155147134380828191841",
                    "239987518835152770604035393540266182148"
                  ]
                },
                "source": "https://github.com/skvadrik/re2c/commit/c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776a",
                "target": {
                  "file": "src/parse/scanner.cc"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:43:59Z"
          }
        }
      ],
      "modified": "2026-10-20T13:43:59.219474134Z",
      "provider": "osv",
      "references": [
        "https://blogs.gentoo.org/ago/2020/04/19/re2c-heap-overflow-in-scannerfill-scanner-cc/",
        "https://security.gentoo.org/glsa/202007-28",
        "https://usn.ubuntu.com/4338-1/",
        "https://usn.ubuntu.com/4338-2/",
        "https://www.openwall.com/lists/oss-security/2020/04/19/1",
        "https://github.com/skvadrik/re2c/commit/c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776a"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*",
              "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
            ],
            "vendor_product": "canonical:ubuntu_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "19.10"
                  },
                  {
                    "last_affected": "19.10"
                  },
                  {
                    "introduced": "20.04"
                  },
                  {
                    "last_affected": "20.04"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-11958",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387999,
  "published_at": "2020-04-21T01:15:11.57+00:00"
}