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EUVD-2026-262940

fkie_cve-2025-66567

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.

GHSA-9v8j-x534-2fx3 — Ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)

Affected: RubyGems: ruby-saml

### 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

UBUNTU-CVE-2025-66567

Affected: Ubuntu:Pro:16.04:LTS: ruby-saml, Ubuntu:Pro:18.04:LTS: ruby-saml, Ubuntu:Pro:20.04:LTS: ruby-saml, Ubuntu:Pro:22.04:LTS: ruby-saml, Ubuntu:Pro:24.04:LTS: ruby-saml

WID-SEC-W-2025-2764 — Ruby SAML: Mehrere Schwachstellen ermöglichen Umgehen von Sicherheitsvorkehrungen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Ruby SAML ausnutzen, um Sicherheitsvorkehrungen zu umgehen.