The json-jwt (aka JSON::JWT) gem 1.16.3 for Ruby sometimes allows bypass of identity checks via a sign/encryption confusion attack. For example, JWE can sometimes be used to bypass JSON::JWT.decode.

Affected: RubyGems: json-jwt

The json-jwt (aka JSON::JWT) gem 1.16.x before 1.16.6, 1.15.x before 1.15.3.1 for Ruby sometimes allows bypass of identity checks via a sign/encryption confusion attack. For example, JWE can sometimes be used to bypass JSON::JWT.decode.

Security update for rubygem-json-jwt

Affected: Ubuntu:18.04:LTS: ruby-json-jwt, Ubuntu:20.04:LTS: ruby-json-jwt, Ubuntu:22.04:LTS: ruby-json-jwt, Ubuntu:24.04:LTS: ruby-json-jwt, Ubuntu:25.10: ruby-json-jwt, Ubuntu:26.10: ruby-json-jwt, Ubuntu:26.04:LTS: ruby-json-jwt

The json-jwt (aka JSON::JWT) gem 1.16.3 for Ruby sometimes allows bypass of identity checks via a sign/encryption confusion attack. For example, JWE can sometimes be used to bypass JSON::JWT.decode.