CVE-2026-49454Critical· 9.1▾ MidnightRelyra SAML SignatureValue not cryptographically verified -> authentication bypass
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 50.1 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.1%
0.1% → 0.2%
Relyra 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.
In 1.0.0 and 1.1.0, the XMLDSig trust boundary was incomplete. :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 can be accepted as {:ok}. Any relying-party application using Relyra 1.0.0 or 1.1.0 can be logged into as an arbitrary user if it trusts the affected response path.
Relyra 1.2.0 closes the gap with real exclusive-C14N canonicalization, :public_key.verify against the configured IdP certificate's public key, and a constant-time DigestValue recompute/compare bound to the exact consumed node on both verify/4 and verify_metadata_root/4.
There is no safe configuration of 1.0.0 or 1.1.0. Upgrade to 1.2.0 or later.
2e45689 (wire real XMLDSig crypto into the candidate arm)8910200 (close metadata trust bypass, pin over DER)test/security/xml/adversarial_crypto_test.exs, test/relyra/metadata/auto_refresh_test.exs, test/security/ci_gate_integrity_test.exsrelyra >= 1.0.0, < 1.2.0Upgrade to a patched release:
relyra 1.2.0Connected by shared product, vendor, weakness, or advisory.
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