Security advisory

{
  "id": "2c76ce2119d69ff5ba94920988ac47a2f61b3cc9b749a11f4fbd7865bb4286c6",
  "url": "https://osv.dev/vulnerability/CVE-2021-36692",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-36692",
    "summary": "libjxl v0.3.7 is affected by a Divide By Zero in issue in lib/extras/codec_apng.cc jxl::DecodeImageAPNG(). When encoding a malicous APNG file using cjxl, an attacker can trigger a denial of service.",
    "evidence": "osv:CVE-2021-36692",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-36692",
      "aliases": [
        "CVE-2021-36692"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libjxl/libjxl",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9e9bce86164dc4d01c39eeeb3404d6aed85137b2"
                },
                {
                  "last_affected": "9e9bce86164dc4d01c39eeeb3404d6aed85137b2"
                },
                {
                  "fixed": "7dfa400ded53919d986c5d3d23446a09e0cf481b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libjxl_project:libjxl:0.3.7:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.3.7"
                      },
                      {
                        "last_affected": "0.3.7"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7dfa400ded53919d986c5d3d23446a09e0cf481b"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.3.7",
            "v0.3.7"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-36692.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-36692-13120598",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "218996673675454636206971500351580687935",
                    "289713015421704113962406939315262015326",
                    "151492106284367248620221020173088946544"
                  ]
                },
                "source": "https://github.com/libjxl/libjxl/commit/7dfa400ded53919d986c5d3d23446a09e0cf481b",
                "target": {
                  "file": "lib/extras/codec_apng.cc"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-36692-77f02abb",
                "digest": {
                  "length": 5308,
                  "function_hash": "83732117007404789023064002931192555137"
                },
                "source": "https://github.com/libjxl/libjxl/commit/7dfa400ded53919d986c5d3d23446a09e0cf481b",
                "target": {
                  "file": "lib/extras/codec_apng.cc",
                  "function": "DecodeImageAPNG"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:04:49Z"
          }
        }
      ],
      "modified": "2026-10-20T14:04:49.894055816Z",
      "provider": "osv",
      "references": [
        "https://github.com/libjxl/libjxl/issues/308",
        "https://github.com/libjxl/libjxl/commit/7dfa400ded53919d986c5d3d23446a09e0cf481b",
        "https://github.com/libjxl/libjxl/pull/313"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-36692",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388537,
  "published_at": "2021-08-30T21:15:09.413+00:00"
}