Security advisory

{
  "id": "d6002898a272740268d432e4b74f3fd7d61c8d8f045dec0aea8b83ba898d3c50",
  "url": "https://osv.dev/vulnerability/CVE-2021-39171",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-39171",
    "summary": "Passport-SAML is a SAML 2.0 authentication provider for Passport, the Node.js authentication library. Prior to version 3.1.0, a malicious SAML payload can require transforms that consume significant system resources to process, thereby resulting in reduced or denied service. This would be an effective way to perform a denial-of-service attack. This has been resolved in version 3.1.0. The resolution is to limit the number of allowable transforms to 2.",
    "evidence": "osv:CVE-2021-39171",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-39171",
      "aliases": [
        "CVE-2021-39171",
        "GHSA-5379-r78w-42h2"
      ],
      "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/node-saml/passport-saml",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f1e00b64c21a725f545e675cd810bbaa435a3972"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:passport-saml_project:passport-saml:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.0.0",
            "v2.0.5",
            "v2.0.4",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0",
            "v1.5.0",
            "v1.4.2",
            "v1.4.1",
            "v1.4.0",
            "v1.3.5",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.0",
            "v1.1.0",
            "v1.0.0",
            "v0.35.0",
            "v0.34.0",
            "v0.33.0",
            "v0.32.1",
            "v0.32.0",
            "v0.30.0",
            "v0.20.2",
            "v0.16.2",
            "v0.16.1",
            "v0.16.0",
            "v0.15.0",
            "v0.14.0",
            "v0.13.0",
            "v0.12.0",
            "v0.11.1",
            "v0.11.0",
            "v0.10.0",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.0",
            "v0.7.0",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.0",
            "v0.3.0",
            "v0.2.1",
            "v0.2.0",
            "v0.1.0",
            "v0.0.3",
            "0.0.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-39171.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:54.177327449Z",
      "provider": "osv",
      "references": [
        "https://github.com/node-saml/passport-saml/security/advisories/GHSA-5379-r78w-42h2",
        "https://github.com/node-saml/passport-saml/pull/595"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-39171",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386423,
  "published_at": "2021-08-27T22:15:07.267+00:00"
}