CVE-2026-49454: Relyra Authentication Bypass Vulnerability
CRITICALCVE-2026-49454 is a CRITICAL (CVSS 9.1) authentication bypass vulnerability (CWE-287: Improper Authentication) affecting Relyra libraries in the Hex ecosystem. The issue involves relyra saml signaturevalue not cryptographically verified -> authentication bypass. Remediation is available by upgrading affected packages to version 1.2.0.
CVE-2026-49454 at a Glance
Security Impact
CVSS: 9.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
How to Fix CVE-2026-49454
To remediate this vulnerability, upgrade all affected Relyra dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade relyra to 1.2.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for relyraHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-49454, inspect your project dependencies for Relyra:
inspect dependencies for relyraAnalyze the terminal output to locate any version of Relyra in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.2.0), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Relyra, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-49454 Affected Relyra Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
relyra
|
Hex |
≥ 1.0.0
< 1.2.0
|
1.2.0
|
References
Frequently Asked Questions
What is CVE-2026-49454?
Which Relyra versions are affected?
What version fixes CVE-2026-49454?
Is relyra affected?
What is the CVSS score of CVE-2026-49454?
What CWE is associated with CVE-2026-49454?
How can I check Hex dependencies for CVE-2026-49454?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-jv46-xfwm-36j7",
"modified" : "2026-06-26T21:05:13Z",
"published" : "2026-06-26T21:05:13Z",
"aliases" : [ "CVE-2026-49454" ],
"summary" : "Relyra SAML SignatureValue not cryptographically verified -> authentication bypass",
"details" : "## Summary\n\nRelyra `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.\n\n## Details\n\nIn `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.\n\n## Impact\n\nA 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.\n\n## Patches\n\nRelyra `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`.\n\n## Workarounds\n\nThere is no safe configuration of `1.0.0` or `1.1.0`. Upgrade to `1.2.0` or later.\n\n## Resources\n\n- Fix commit `2e45689` (wire real XMLDSig crypto into the candidate arm)\n- Fix commit `8910200` (close metadata trust bypass, pin over DER)\n- Regression proof: `test/security/xml/adversarial_crypto_test.exs`, `test/relyra/metadata/auto_refresh_test.exs`, `test/security/ci_gate_integrity_test.exs`",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Hex",
"name" : "relyra"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.0.0"
}, {
"fixed" : "1.2.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/szTheory/relyra/security/advisories/GHSA-jv46-xfwm-36j7"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-49454"
}, {
"type" : "WEB",
"url" : "https://github.com/szTheory/relyra/commit/2e456897af3158c175bb490ce7fc51d6241c8922"
}, {
"type" : "WEB",
"url" : "https://github.com/szTheory/relyra/commit/8910200"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/szTheory/relyra"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-287", "CWE-347" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2026-06-26T21:05:13Z",
"nvd_published_at" : "2026-06-18T21:16:29Z"
}
}