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TI-2026-36609 Aliases CVE-2026-49454GHSA-jv46-xfwm-36j7

Relyra SAML SignatureValue not cryptographically verified -> authentication bypass

Priority MEDIUM 47CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00226 13th percentileScored 2026-11-07
Fix Fixed relyra (szTheory): 1.2.0relyra (Hex): 1.2.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
szTheoryrelyra1.0.0 to before 1.2.01.2.0Patch availableCNA
—relyra (Hex)1.0.0 to before 1.2.01.2.0Patch availableGHSA-jv46-xfwm-36j7
  • relyra VendorszTheory Affected 1.0.0 to before 1.2.0 Fixed in 1.2.0 Patch available CNA
  • relyra (Hex) Vendor— Affected 1.0.0 to before 1.2.0 Fixed in 1.2.0 Patch available GHSA-jv46-xfwm-36j7

Remediation

  • Fix · CNA relyra (szTheory) Fixed in 1.2.0
  • Fix · GHSA-jv46-xfwm-36j7 relyra (Hex) Fixed in 1.2.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49454
  2. 2026-10-03 Alias added: GHSA-jv46-xfwm-36j7

References

Advisory 1

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences