Improper Verification of Cryptographic Signature Affecting ruby-saml package, versions <1.18.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-RUBYSAML-14222437
- published9 Dec 2025
- disclosed8 Dec 2025
- creditd0ge
Introduced: 8 Dec 2025
NewCVE-2025-66567 (opens in a new tab)How to fix?
Upgrade ruby-saml to version 1.18.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature due to differences in XML document namespace parsing between REXML and Nokogiri, implemented in xml_security.rb. An attacker can bypass authentication via Signature Wrapping attack.
Note: This vulnerability is a bypass of the fix for CVE-2025-25292 in version 1.12.4. Version 1.18.0 is not vulnerable to this bypass.