{"cve":"CVE-2025-66567","nvd":{"published":"2025-12-09T16:18:21.260","modified":"2026-10-14T21:10:00.183","status":"Analyzed","description":"The ruby-saml library is for implementing the client side of a SAML authorization. ruby-saml versions up to and including 1.12.4 contain an authentication bypass vulnerability due to an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, generating entirely different document structures from the same input. This allows an attacker to execute a Signature Wrapping attack. This issue is fixed in version 1.18.0.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":9.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-347"],"references":["https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97","https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3","https://github.com/advisories/GHSA-754f-8gm6-c4r2"],"products":["onelogin:ruby-saml"],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2025-66567","score":0.00417,"percentile":0.3567,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-9v8j-x534-2fx3","url":"https://osv.dev/vulnerability/GHSA-9v8j-x534-2fx3","summary":"Ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)","modified":"2026-02-04T02:32:35.929310Z","packages":[{"ecosystem":"RubyGems","name":"ruby-saml","purl":"pkg:gem/ruby-saml","ranges":["<1.18.0"],"fixed":["1.18.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}