{"id":"CVE-2021-39171","aliases":["EUVD-2021-1569","GHSA-5379-r78w-42h2"],"status":"published","title":"Unlimited transforms allowed for signed nodes","description":"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.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01323,"percentile":0.71316,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2021-08-27T22:05:11Z","modified":"2026-10-20T10:54:54Z","fixes":[{"ecosystem":"npm","package":"passport-saml","fixed_in":["3.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"passport-saml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0"}]}]},{"source":"osv","ecosystem":"npm","package":"passport-saml","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.0"}]}]}],"products":[{"vendor":"node-saml","product":"passport-saml"},{"vendor":"passport-saml_project","product":"passport-saml"}],"references":[{"url":"https://github.com/node-saml/passport-saml/security/advisories/GHSA-5379-r78w-42h2","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/node-saml/passport-saml/pull/595","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39171","tags":["advisory"]},{"url":"https://github.com/node-saml/passport-saml/commit/f1e00b64c21a725f545e675cd810bbaa435a3972","tags":["web"]},{"url":"https://github.com/advisories/GHSA-5379-r78w-42h2"},{"url":"https://github.com/node-saml/passport-saml","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-39171","title":"Unlimited transforms allowed for signed nodes","description":"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.","status":"published","published":"2021-08-27T22:05:11Z","modified":"2024-08-04T01:58:18.15Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:33:09.864034Z"}],"euvd":[{"id":"EUVD-2021-1569","description":"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.","status":"published","published":"2021-08-27T22:05:11Z","modified":"2024-08-04T01:58:18Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T03:24:24.305495Z"}],"ghsa":[{"id":"GHSA-5379-r78w-42h2","title":"Unlimited transforms allowed for signed nodes","description":"### Impact\nA 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.\n\n### Patches\nThis has been resolved in version 3.1.0. The resolution is to limit the number of allowable transforms to 2.\n\n### References\nhttps://github.com/node-saml/passport-saml/pull/595\n","status":"published","published":"2021-08-30T16:11:57Z","modified":"2024-02-10T00:55:48Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:37:37.394986Z"}],"nvd":[{"id":"CVE-2021-39171","description":"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.","status":"published","published":"2021-08-27T22:15:07.267Z","modified":"2026-06-17T04:03:14.56Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:06:57.67549Z"}],"osv":[{"id":"CVE-2021-39171","description":"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.","status":"published","published":"2021-08-27T22:15:07.267Z","modified":"2026-10-20T10:54:54.177327449Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:20.843843Z"},{"id":"GHSA-5379-r78w-42h2","title":"Unlimited transforms allowed for signed nodes","description":"### Impact\nA 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.\n\n### Patches\nThis has been resolved in version 3.1.0. The resolution is to limit the number of allowable transforms to 2.\n\n### References\nhttps://github.com/node-saml/passport-saml/pull/595\n","status":"published","published":"2021-08-30T16:11:57Z","modified":"2026-07-08T06:29:28.325301586Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:46:37.864461Z"}]}}