{"id":"CVE-2025-66567","aliases":["GHSA-9v8j-x534-2fx3"],"url":"https://o3.security/vulnerability/CVE-2025-66567","summary":"ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)","details":"### Summary\n\nRuby-saml up to and including 1.12.4, there is an authentication bypass vulnerability because of an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, the parsers can generate entirely different document structures from the same XML input. That allows an attacker to be able to execute a Signature Wrapping attack. The vulnerability does not affect the version 1.18.0.\n\n### Impact\nThat allows an attacker to be able to execute a Signature Wrapping attack and bypass the authentication","published":"2025-12-09T01:55:06.296Z","modified":"2026-08-27T03:30:21.943202669Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"ruby-saml","fixedVersion":"1.18.0"}],"fix":{"url":"https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97","label":"SAML-Toolkits/ruby-saml@e9c1cdb"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66567.json"},{"type":"ADVISORY","url":"https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-754f-8gm6-c4r2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66567"},{"type":"FIX","url":"https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97"},{"type":"PACKAGE","url":"https://github.com/SAML-Toolkits/ruby-saml"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/ruby-saml/CVE-2025-66567.yml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T03:30:21.943202669Z"}}