Fastjson

Alibaba Fastjson 1.x checkAutoType Bypass to Remote Code Execution via jar:http SSRF and fd-Reread Trick (CVE-2026-16723)

CVE-2026-16723 is a critical, unauthenticated remote code execution vulnerability in Alibaba Fastjson 1.2.68 through 1.2.83, actively exploited in the wild against Spring Boot fat-JAR deployments. Under Fastjson stock defaults (AutoType disabled, SafeMode…