Fixed:
- Security issue: an attacker specifying a large "p2c" value can cause JSONWebEncryption.Decrypt and JSONWebEncryption.DecryptMulti to consume large amounts of CPU, causing a DoS. Thanks to Matt Schwager (@mschwager) for the disclosure and to Tom Tervoort for originally publishing the category of attack. https://i.blackhat.com/BH-US-23/Presentations/US-23-Tervoort-Three-New-Attacks-Against-JSON-Web-Tokens.pdf