Improper Verification of Cryptographic Signature The advisory has been revoked - it doesn't affect any version of package rubygem-jwt (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-RUBYGEMJWT-17997464
- published17 Jul 2026
- disclosed14 Jul 2026
Introduced: 14 Jul 2026
CVE-2026-45363 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rubygem-jwt package and not the rubygem-jwt package as distributed by RHEL.
ruby-jwt is a Ruby implementation of the RFC 7519 OAuth JSON Web Token standard. Prior to 2.10.3 and 3.2.0, JWT.decode(token, '', true, algorithm: 'HS256') accepts an attacker-forged token because OpenSSL::HMAC.digest('SHA256', '', payload) returns a valid digest under an empty key and no empty-key precondition exists in the HMAC algorithm. The same path is reached when a keyfinder block or key_finder: argument returns an empty string, nil, or an array containing nil for an unknown key, affecting HS256, HS384, and HS512 verification through JWT.decode and JWT::EncodedToken#verify_signature!. This issue is fixed in versions 2.10.3 and 3.2.0.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2500739
- https://access.redhat.com/security/cve/CVE-2026-45363
- https://github.com/jwt/ruby-jwt/commit/9820020869ad147b941e49d96ab8beba35532964
- https://github.com/jwt/ruby-jwt/commit/db560b769a07bd9724e77ff505011ac01872106f
- https://github.com/jwt/ruby-jwt/releases/tag/v2.10.3
- https://github.com/jwt/ruby-jwt/releases/tag/v3.2.0
- https://github.com/jwt/ruby-jwt/security/advisories/GHSA-c32j-vqhx-rx3x
- https://lists.debian.org/debian-lts-announce/2026/09/msg00022.html