ADVISORIES

• CVE-2025-66567 (NVD)
• GHSA-9v8j-x534-2fx3
• Vendor Advisory

GEM

ruby-saml

SEVERITY

CVSS v3.x: 9.1 (Critical)

PATCHED VERSIONS

• >= 1.18.0

DESCRIPTION

Summary

Ruby-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.

Impact

That allows an attacker to be able to execute a Signature Wrapping attack and bypass the authentication

RELATED

• https://nvd.nist.gov/vuln/detail/CVE-2025-66567
• https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3
• https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97
• https://github.com/advisories/GHSA-754f-8gm6-c4r2
• https://github.com/advisories/GHSA-9v8j-x534-2fx3