Security advisory

{
  "id": "71212933ac72273c46c1a13a20ca38e7959606ef284410231c71f605a01b022d",
  "url": "https://osv.dev/vulnerability/CVE-2021-33657",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-33657",
    "summary": "There is a heap overflow problem in video/SDL_pixels.c in SDL (Simple DirectMedia Layer) 2.x to 2.0.18 versions. By crafting a malicious .BMP file, an attacker can cause the application using this library to crash, denial of service or Code execution.",
    "evidence": "osv:CVE-2021-33657",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-33657",
      "aliases": [
        "CVE-2021-33657"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libsdl-org/sdl",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1ad936eb29cf4506a7a103e8288d732f23e9c2b0"
                },
                {
                  "last_affected": "2e9821423a237a1206e3c09020778faacfe430be"
                },
                {
                  "fixed": "8c91cf7dba5193f5ce12d06db1336515851c9ee9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libsdl:simple_directmedia_layer:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "last_affected": "2.0.18"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8c91cf7dba5193f5ce12d06db1336515851c9ee9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33657.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-33657-493fc812",
                "digest": {
                  "length": 673,
                  "function_hash": "135559890956021690986487977211098728481"
                },
                "source": "https://github.com/libsdl-org/sdl/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9",
                "target": {
                  "file": "src/video/SDL_pixels.c",
                  "function": "Map1to1"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-33657-52cbc3ff",
                "digest": {
                  "length": 860,
                  "function_hash": "120029847142050598506380381411279339480"
                },
                "source": "https://github.com/libsdl-org/sdl/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9",
                "target": {
                  "file": "src/video/SDL_pixels.c",
                  "function": "Map1toN"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-33657-795aa1c9",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
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                    "43469035986305709707052829820256164457",
                    "101640187021522532256005357573848813681"
                  ]
                },
                "source": "https://github.com/libsdl-org/sdl/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9",
                "target": {
                  "file": "src/video/SDL_pixels.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:23:26Z"
          }
        }
      ],
      "modified": "2026-10-20T14:23:26.385626802Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2023/02/msg00008.html",
        "https://security.gentoo.org/glsa/202305-17",
        "https://security.gentoo.org/glsa/202305-18",
        "https://github.com/libsdl-org/SDL/commit/8c91cf7dba5193f5ce12d06db1336515851c9ee9"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-33657",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388863,
  "published_at": "2022-04-01T23:15:10.363+00:00"
}