{"id":"CVE-2025-66567","aliases":["EUVD-2025-201812","GHSA-9v8j-x534-2fx3","UBUNTU-CVE-2025-66567"],"status":"published","title":"ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)","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.","severity":{"version":"4.0","score":9.3,"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","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00418,"percentile":0.36429,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-347"],"published":"2025-12-08T21:30:56Z","modified":"2026-10-28T02:30:34Z","fixes":[{"ecosystem":"RubyGems","package":"ruby-saml","fixed_in":["1.18.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"ruby-saml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0"}]}]},{"source":"osv","ecosystem":"RubyGems","package":"ruby-saml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0"}]}],"versions":["0.0.5","0.0.6","0.0.7","0.0.8","0.2.1","0.2.2","0.2.3","0.3.0","0.3.1","0.3.2","0.3.3","0.3.4","0.4.0","0.4.1","0.4.2","0.4.3","0.4.4","0.4.5","0.4.6","0.4.7","0.5.0","0.5.1","0.5.2","0.5.3","0.6.0","0.7.0","0.7.1","0.7.2","0.7.3","0.8.0","0.8.1","0.8.10","0.8.11","0.8.12","0.8.13","0.8.14","0.8.15","0.8.16","0.8.17","0.8.18","0.8.2","0.8.3","0.8.4","0.8.5","0.8.6","0.8.7","0.8.8","0.8.9","0.9","0.9.1","0.9.2","0.9.3","0.9.4","1.0.0","1.1.0","1.1.1","1.1.2","1.10.0","1.10.1","1.10.2","1.11.0","1.12.0","1.12.1","1.12.2","1.12.3","1.12.4","1.13.0","1.14.0","1.15.0","1.16.0","1.17.0","1.2.0","1.3.0","1.3.1","1.4.0","1.4.1","1.4.2","1.4.3","1.5.0","1.6.0","1.6.1","1.6.2","1.7.0","1.7.1","1.7.2","1.8.0","1.9.0"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"ruby-saml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.2-1","1.0.0-1","1.1.2-1ubuntu1","1.1.2-1ubuntu1+esm1","1.1.2-1ubuntu1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"ruby-saml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.1-1","1.7.2-1","1.7.2-1ubuntu0.1~esm1","1.7.2-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"ruby-saml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.2-1","1.11.0-1","1.11.0-1ubuntu0.1","1.11.0-1ubuntu0.1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"ruby-saml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.0-1","1.13.0-1","1.13.0-1ubuntu0.1","1.13.0-1ubuntu0.1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"ruby-saml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15.0-1","1.15.0-1ubuntu0.24.04.1","1.15.0-1ubuntu0.24.04.1+esm1"]}],"products":[{"vendor":"onelogin","product":"ruby-saml"},{"vendor":"saml-toolkits","product":"ruby-saml"}],"references":[{"url":"https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web","report"]},{"url":"https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97","tags":["x_refsource_MISC","Patch","fix","web","report"]},{"url":"https://github.com/advisories/GHSA-754f-8gm6-c4r2","tags":["x_refsource_MISC","Not Applicable","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66567","tags":["advisory"]},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/ruby-saml/CVE-2025-66567.yml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-9v8j-x534-2fx3"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66567.json","tags":["advisory"]},{"url":"https://github.com/SAML-Toolkits/ruby-saml","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2025-66567","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-66567","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-66567","title":"ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)","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.","status":"published","published":"2025-12-09T01:55:06.296Z","modified":"2025-12-09T16:02:57.27Z","cvss":[{"version":"4.0","score":9.3,"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","level":"critical","assessor":"cna"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:32:53.157279Z"}],"euvd":[{"id":"EUVD-2025-201812","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.","status":"published","published":"2025-12-09T01:55:06Z","modified":"2025-12-09T16:02:57Z","cvss":[{"version":"4.0","score":9.3,"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","level":"critical"}],"updated_at":"2026-11-02T19:49:08.049254Z"}],"ghsa":[{"id":"GHSA-9v8j-x534-2fx3","title":"Ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)","description":"### 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","status":"published","published":"2025-12-08T21:30:56Z","modified":"2025-12-12T21:53:09Z","cvss":[{"version":"4.0","score":9.3,"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","level":"critical"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:39:13.204325Z"}],"nvd":[{"id":"CVE-2025-66567","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.","status":"published","published":"2025-12-09T16:18:21.26Z","modified":"2026-10-14T21:10:00.183Z","cvss":[{"version":"4.0","score":9.3,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"primary"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:11:49.468427Z"}],"osv":[{"id":"CVE-2025-66567","title":"ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)","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.","status":"published","published":"2025-12-09T01:55:06.296Z","modified":"2026-10-28T02:30:34.654271196Z","cvss":[{"version":"4.0","score":9.3,"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","level":"critical"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T15:44:52.202386Z"},{"id":"GHSA-9v8j-x534-2fx3","title":"Ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)","description":"### 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","status":"published","published":"2025-12-08T21:30:56Z","modified":"2026-02-04T02:32:35.92931Z","cvss":[{"version":"4.0","score":9.3,"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","level":"critical"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T15:46:44.225359Z"},{"id":"UBUNTU-CVE-2025-66567","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.","status":"published","published":"2025-12-09T16:18:00Z","modified":"2026-01-20T18:42:24.963133Z","cvss":[{"version":"4.0","score":9.3,"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","level":"critical"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T16:55:52.345622Z"}]}}