CVE-2025-25292: Ruby SAML allows a SAML authentication bypass due to namespace handling (parser differential)
(updated )
An authentication bypass vulnerability was found in ruby-saml due to a parser differential. 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.
References
- about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released
- github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials
- github.com/SAML-Toolkits/ruby-saml
- github.com/SAML-Toolkits/ruby-saml/commit/e76c5b36bac40aedbf1ba7ffaaf495be63328cd9
- github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97
- github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4
- github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0
- github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-754f-8gm6-c4r2
- github.com/advisories/GHSA-754f-8gm6-c4r2
- github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv
- github.com/rubysec/ruby-advisory-db/blob/master/gems/ruby-saml/CVE-2025-25292.yml
- lists.debian.org/debian-lts-announce/2025/04/msg00011.html
- news.ycombinator.com/item?id=43374519
- nvd.nist.gov/vuln/detail/CVE-2025-25292
- portswigger.net/research/saml-roulette-the-hacker-always-wins
- security.netapp.com/advisory/ntap-20250314-0009
- securitylab.github.com/advisories/GHSL-2024-329_GHSL-2024-330_ruby-saml
Code Behaviors & Features
Detect and mitigate CVE-2025-25292 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →