Security advisory

{
  "id": "03b8cf8c290535315b370044771d872e37b1b0782871d42fff939027774a5bcc",
  "url": "https://osv.dev/vulnerability/CVE-2021-27292",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-27292",
    "summary": "ua-parser-js >= 0.7.14, fixed in 0.7.24, uses a regular expression which is vulnerable to denial of service. If an attacker sends a malicious User-Agent header, ua-parser-js will get stuck processing it for an extended period of time.",
    "evidence": "osv:CVE-2021-27292",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-27292",
      "aliases": [
        "CVE-2021-27292",
        "GHSA-78cj-fxph-m83p"
      ],
      "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/faisalman/ua-parser-js",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7ae3098778572742544385938a2726c4efa01a02"
                },
                {
                  "fixed": "9999815ac8c969306594c650566695fba3506830"
                },
                {
                  "fixed": "809439e20e273ce0d25c1d04e111dcf6011eb566"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ua-parser-js_project:ua-parser-js:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0.7.14"
                      },
                      {
                        "fixed": "0.7.24"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "809439e20e273ce0d25c1d04e111dcf6011eb566"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.7.21",
            "0.7.20",
            "0.7.19",
            "0.7.18",
            "0.7.14"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27292.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/pygments/pygments",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2e7e8c4a7b318f4032493773732754e418279a14"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "2e7e8c4a7b318f4032493773732754e418279a14"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.7.3",
            "2.7.2",
            "2.7.1",
            "2.7.0",
            "2.6.1",
            "2.6.0",
            "2.5.2",
            "2.5.1",
            "2.5.0",
            "2.4.2",
            "2.4.1",
            "2.1.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27292.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:35.503024954Z",
      "provider": "osv",
      "references": [
        "https://github.com/faisalman/ua-parser-js/commit/809439e20e273ce0d25c1d04e111dcf6011eb566",
        "https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14",
        "https://gist.github.com/b-c-ds/6941d80d6b4e694df4bc269493b7be76"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-27292",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385681,
  "published_at": "2021-03-17T13:15:15.2+00:00"
}