A time-sensitive equality check on the JWT signature in the JsonWebToken.validate method in main/scala/authentikat/jwt/JsonWebToken.scala in authentikat-jwt (aka com.jason-goodwin/authentikat-jwt) version 0.4.5 and earlier allows the supplier of a JWT token to guess bit after bit of the signature by repeating validation requests.
{ "nvd_published_at": null, "cwe_ids": [], "severity": "CRITICAL", "github_reviewed": true, "github_reviewed_at": "2020-06-16T20:56:11Z" }