Security advisory

{
  "id": "bb2d1050f541c0f5fc300395f94154ce97100688997f31be5a0186488e5f142c",
  "url": "https://osv.dev/vulnerability/CVE-2021-43579",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-43579",
    "summary": "A stack-based buffer overflow in image_load_bmp() in HTMLDOC <= 1.9.13 results in remote code execution if the victim converts an HTML document linking to a crafted BMP file.",
    "evidence": "osv:CVE-2021-43579",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-43579",
      "aliases": [
        "CVE-2021-43579"
      ],
      "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/michaelrsweet/htmldoc",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "7ca2b30f9b3ae8f2ad429e222ebaa5be8764f409"
                },
                {
                  "fixed": "27d08989a5a567155d506ac870ae7d8cc88fa58b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:htmldoc_project:htmldoc:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.9.13"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "27d08989a5a567155d506ac870ae7d8cc88fa58b"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.9.12",
            "v1.9.11",
            "v1.9.10",
            "v1.9.9",
            "v1.9.8",
            "v1.9.7",
            "v1.9.6",
            "v1.9.5",
            "v1.9.4",
            "v1.9.3",
            "v1.9.2",
            "v1.9.1",
            "v1.9",
            "v1.8.30"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43579.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-43579-3dcf72e3",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "75444419729333380443052050884245593707",
                    "52953918717421753729251150082072149909",
                    "152886919627866368274563169380254036118",
                    "198152111810803722130400047947566870774",
                    "304108754680799189403228624423602673270",
                    "157781778164509291172586315901535516558",
                    "70669642789662802104105858184899219014",
                    "168806463103019594349885454995563723793"
                  ]
                },
                "source": "https://github.com/michaelrsweet/htmldoc/commit/27d08989a5a567155d506ac870ae7d8cc88fa58b",
                "target": {
                  "file": "htmldoc/image.cxx"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-43579-8b2b6b1d",
                "digest": {
                  "length": 4321,
                  "function_hash": "79376633260742945387846236869644820982"
                },
                "source": "https://github.com/michaelrsweet/htmldoc/commit/27d08989a5a567155d506ac870ae7d8cc88fa58b",
                "target": {
                  "file": "htmldoc/image.cxx",
                  "function": "image_load_bmp"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:34:27Z"
          }
        }
      ],
      "modified": "2026-10-20T14:34:27.778981547Z",
      "provider": "osv",
      "references": [
        "https://github.com/michaelrsweet/htmldoc/compare/v1.9.12...v1.9.13",
        "https://lists.debian.org/debian-lts-announce/2022/02/msg00022.html",
        "https://github.com/michaelrsweet/htmldoc/commit/27d08989a5a567155d506ac870ae7d8cc88fa58b",
        "https://github.com/michaelrsweet/htmldoc/issues/453",
        "https://github.com/michaelrsweet/htmldoc/issues/456"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-43579",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 389721,
  "published_at": "2022-01-10T14:10:24.167+00:00"
}