Fastjson is a fast Java-based JSON parser/generator. Fastjson versions prior to 1.2.83 have a security vulnerability that stems from the ease of bypassing the default autoType off restriction to deserialize untrusted data, which could be exploited by an attacker to attack a remote server. This rule supports to defend the A6: Vulnerable and Outdated Components of OWASP Top 10 - 2021. Other reference:None