python-jose before 1.3.2 allows attackers to have unspecified impact by leveraging failure to use a constant time comparison for HMAC keys.

jose-php before 2.2.1 does not use constant-time operations for HMAC comparison, which makes it easier for remote attackers to obtain sensitive information via a timing attack, related to JWE.php and JWS.php.

The RSA 1.5 algorithm implementation in the JOSE_JWE class in JWE.php in jose-php before 2.2.1 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartext data via a Million Message Attack (MMA).