CVE-2025-66568 identifies a critical vulnerability in the ruby-saml library, allowing a Libxml2 Canonicalization error to bypass SAML Digest and Signature validation. This flaw enables attackers to manipulate SAML assertions without detection, potentially leading to unauthorized access, privilege escalation, or other security compromises in applications relying on ruby-saml for authentication and authorization. Given its critical severity, immediate attention and remediation are required for affected systems to maintain the integrity and security of SAML-based authentication flows.

Technical Details#

  • CVE ID: CVE-2025-66568
  • Published: 2025-12-10 11:09 UTC
  • Product: ruby-saml
  • Risk Score: 5.3/10
  • Severity: CRITICAL
  • Original Source: View on Google_OSV

Remediation#

To remediate CVE-2025-66568, organizations should immediately update ruby-saml to the latest patched version available from the vendor. Monitor official ruby-saml project releases and security advisories for specific version numbers that address this Libxml2 canonicalization issue. After updating, verify that the SAML assertions are correctly signed and validated. As a proactive measure, implement robust logging and monitoring for SAML authentication failures and unusual assertion patterns.

Disclaimer: This summary was generated by an Artificial Intelligence system and has not been verified by a human expert. Use at your own risk.

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