Vulnerability Description
Relyra is a strict-by-default SAML 2.0 Service Provider library for Elixir and Phoenix. Versions 1.0.0 and 1.1.0 accept forged SAML signatures because SignatureValue was not cryptographically verified before the library returned a successful authentication result. The XMLDSig trust boundary was incomplete as :public_key.verify over the exclusive-C14N canonicalized SignedInfo was not performed against the configured IdP certificate's public key, DigestValue was not recomputed over the canonicalized referenced element, and canonicalize/2 remained an unused passthrough in the signature-verification path. The result was a structure-only acceptance path where document shape and trust-source rejection could succeed without proving the signature bytes. A forged SignatureValue carrying an attacker-controlled NameID could be accepted as {:ok}. This issue has been fixed in version 1.2.0.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/szTheory/relyra/commit/2e456897af3158c175bb490ce7fc51d6241c89
- https://github.com/szTheory/relyra/commit/8910200
- https://github.com/szTheory/relyra/security/advisories/GHSA-jv46-xfwm-36j7
FAQ
What is CVE-2026-49454?
CVE-2026-49454 is a vulnerability with a CVSS score of 9.1 (CRITICAL). Relyra is a strict-by-default SAML 2.0 Service Provider library for Elixir and Phoenix. Versions 1.0.0 and 1.1.0 accept forged SAML signatures because SignatureValue was not cryptographically verified...
How severe is CVE-2026-49454?
CVE-2026-49454 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-49454?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.