CVE-2026-16723: Alibaba Fastjson

Critical severity, CVSS 9.0. EPSS: 0.7% chance of exploitation in the next 30 days.

A remote code execution (RCE) vulnerability exists in fastjson 1.2.68 through 1.2.83. This vulnerability is exploitable under fastjson's stock default configuration — no AutoType enablement required, no classpath gadget required.

Affected products

• Alibaba Fastjson: from 1.2.68, up to and including 1.2.83

Published 2026-07-23. Last modified 2026-07-23.