ReDoS on endpoint html5client/useragent in BigBlueButton

{
  "id": "7c4be091252ab9a089be346e68b1107e29c909dee32b4187ce34b1d5b53701cf",
  "url": "https://osv.dev/vulnerability/CVE-2022-29169",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ReDoS on endpoint html5client/useragent in BigBlueButton",
    "summary": "BigBlueButton is an open source web conferencing system. Versions starting with 2.2 and prior to 2.3.19, 2.4.7, and 2.5.0-beta.2 are vulnerable to regular expression denial of service (ReDoS) attacks. By using specific a RegularExpression, an attacker can cause denial of service for the bbb-html5 service. The useragent library performs checking of device by parsing the input of User-Agent header and lets it go through lookupUserAgent() (alias of useragent.lookup() ). This function handles input by regexing and attackers can abuse that by providing some ReDos payload using `SmartWatch`. The maintainers removed `htmlclient/useragent` from versions 2.3.19, 2.4.7, and 2.5.0-beta.2. As a workaround, disable NginX forwarding the requests to the handler according to the directions in the GitHub Security Advisory.",
    "evidence": "osv:CVE-2022-29169",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-29169",
      "aliases": [
        "CVE-2022-29169",
        "GHSA-rwrv-p665-4vwp"
      ],
      "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/bigbluebutton/bigbluebutton",
              "type": "GIT",
              "events": [
                {
                  "introduced": "68e35c9d722e62892d2e885646a9eab3bf44f77d"
                },
                {
                  "fixed": "e9df2db16f902a453a250819dffd8029f9ca956d"
                },
                {
                  "introduced": "72d5e54e3eb3cd442d23dc097158fe81f1efda82"
                },
                {
                  "fixed": "eda21682ea3fd472c8d16fe7ec6bcf0f80370a6f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.2.0"
                      },
                      {
                        "fixed": "2.3.19"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.4.0"
                      },
                      {
                        "fixed": "2.4.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.4.6",
            "v2.4.5",
            "v2.4.3",
            "v2.4.4",
            "v2.4.2",
            "v2.4.1",
            "v2.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-29169.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.244521533Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/29xxx/CVE-2022-29169.json",
        "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rwrv-p665-4vwp",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-29169",
        "https://github.com/bigbluebutton/bigbluebutton/pull/14886",
        "https://github.com/bigbluebutton/bigbluebutton/pull/14896"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/29xxx/CVE-2022-29169.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-29169",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494637,
  "published_at": "2022-06-01T22:20:12+00:00"
}