{"id":"CVE-2021-39171","aliases":["GHSA-5379-r78w-42h2"],"url":"https://o3.security/vulnerability/CVE-2021-39171","summary":"Unlimited transforms allowed for signed nodes","details":"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.","published":"2021-08-27T22:15:07.267Z","modified":"2026-07-09T12:20:04.467942Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"passport-saml","fixedVersion":"3.1.0"}],"fix":{"url":"https://github.com/node-saml/passport-saml/pull/595","label":"node-saml/passport-saml#595"},"references":[{"type":"ADVISORY","url":"https://github.com/node-saml/passport-saml/security/advisories/GHSA-5379-r78w-42h2"},{"type":"FIX","url":"https://github.com/node-saml/passport-saml/pull/595"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T12:20:04.467942Z"}}