Security advisory

{
  "id": "86375d45b391d500637c3921cefab68c9bc2ef12790c2ab8f3b6f6d6a7576f29",
  "url": "https://osv.dev/vulnerability/CVE-2020-7662",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-7662",
    "summary": "websocket-extensions npm module prior to 0.1.4 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.",
    "evidence": "osv:CVE-2020-7662",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-7662",
      "aliases": [
        "CVE-2020-7662",
        "GHSA-g78m-2chm-r7qv",
        "SNYK-JS-WEBSOCKETEXTENSIONS-570623"
      ],
      "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/faye/websocket-extensions-node",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5ea0b420804ba6c4219e152b52fd3bdd6d144041"
                },
                {
                  "fixed": "29496f6838bfadfe5a2f85dff33ed0ba33873237"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:websocket-extensions_project:websocket-extensions:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.1.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "29496f6838bfadfe5a2f85dff33ed0ba33873237"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.1.3",
            "0.1.2",
            "0.1.1",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7662.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:24.203478342Z",
      "provider": "osv",
      "references": [
        "https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237",
        "https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions",
        "https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv",
        "https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-7662",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385289,
  "published_at": "2020-06-02T19:15:12.403+00:00"
}