Jwt Ruby Jwt vulnerabilities

1 vulnerability

Known vulnerabilities in Jwt Ruby Jwt, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

PrioritiseCVE-2026-45363jwt · ruby-jwt +36 more`jwt` (Ruby gem) - empty-key HMAC bypassruby-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.CVSS9.1CriticalEPSS0.36%