HighFix available

ruby-websocket-extensions — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2020-7663

websocket-extensions ruby module prior to 0.1.5 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.

Products: ruby-websocket-extensions
Affected versions: Not specified
Fixed versions: 0.1.5-1
CVEs: CVE-2020-7663
Confirmed fixed CVEs: Not specified
Updated in this feed: 1 Nov 2026, 13:34 UTC · Revision 1

Source evidence

DEBIAN-CVE-2020-7663

core-osv · Original source

Published 2 Jun 2020, 19:15 UTC

osv:DEBIAN-CVE-2020-7663

ruby-websocket-extensions

Fixed versions: 0.1.5-1

ruby-websocket-extensions

Fixed versions: 0.1.5-1

ruby-websocket-extensions

Fixed versions: 0.1.5-1

Complete source record

{
  "id": "55c5ad516183ff0689d87cc19b62999391af84b7d6ad8a49c674cade980e87d0",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-7663",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2020-7663",
    "summary": "websocket-extensions ruby module prior to 0.1.5 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:DEBIAN-CVE-2020-7663",
    "products": [
      {
        "name": {
          "value": "ruby-websocket-extensions",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.1.5-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "ruby-websocket-extensions",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.1.5-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "ruby-websocket-extensions",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.1.5-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2020-7663",
      "aliases": [
        "DEBIAN-CVE-2020-7663"
      ],
      "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": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.1.5-1"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-websocket-extensions",
            "purl": "pkg:deb/debian/ruby-websocket-extensions?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-7663.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.1.5-1"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-websocket-extensions",
            "purl": "pkg:deb/debian/ruby-websocket-extensions?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-7663.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.1.5-1"
                }
              ]
            }
          ],
          "package": {
            "name": "ruby-websocket-extensions",
            "purl": "pkg:deb/debian/ruby-websocket-extensions?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-7663.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T12:02:33.236146806Z",
      "provider": "osv",
      "upstream": [
        "CVE-2020-7663"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2020-7663"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2020-7663",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 452532,
  "published_at": "2020-06-02T19:15:12.467+00:00"
}