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.
{ "nvd_published_at": "2024-02-29T01:42:05Z", "cwe_ids": [], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2024-03-01T16:56:21Z" }