Security advisory

{
  "id": "011eae4b0288ecca3a145ad16bdc8d7b9cdab1aa5cc5612e1da95511f623d0fd",
  "url": "https://osv.dev/vulnerability/CVE-2021-45985",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-45985",
    "summary": "In Lua 5.4.3, an erroneous finalizer called during a tail call leads to a heap-based buffer over-read.",
    "evidence": "osv:CVE-2021-45985",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-45985",
      "aliases": [
        "BIT-lua-2021-45985",
        "CVE-2021-45985"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/lua/lua",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c33b1728aeb7dfeec4013562660e07d32697aa6b"
                },
                {
                  "fixed": "5d708c3f9cae12820e415d4f89c9eacbe2ab964b"
                },
                {
                  "fixed": "cf613cdc6fa367257fc61c256f63d917350858b5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:lua:lua:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.4.0"
                      },
                      {
                        "fixed": "5.4.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "cf613cdc6fa367257fc61c256f63d917350858b5"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.4.3",
            "v5.4.2",
            "v5.4.1",
            "v5.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-45985.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-45985-607c555b",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
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                  ]
                },
                "source": "https://github.com/lua/lua/commit/cf613cdc6fa367257fc61c256f63d917350858b5",
                "target": {
                  "file": "ldo.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-45985-fe306226",
                "digest": {
                  "length": 1036,
                  "function_hash": "74565152130787818120172892330726743781"
                },
                "source": "https://github.com/lua/lua/commit/cf613cdc6fa367257fc61c256f63d917350858b5",
                "target": {
                  "file": "ldo.c",
                  "function": "luaD_pretailcall"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:06:56Z"
          }
        }
      ],
      "modified": "2026-10-20T14:06:56.937048640Z",
      "provider": "osv",
      "references": [
        "https://www.lua.org/bugs.html#5.4.3-11",
        "https://github.com/lua/lua/commit/cf613cdc6fa367257fc61c256f63d917350858b5"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-45985",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388571,
  "published_at": "2023-04-10T09:15:07.25+00:00"
}