CVE-2026-16723

Critical

Description

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.

SeverityCritical

CVSS9.0

Exploit probability—

ProductCom.alibaba:fastjson

PublishedJul 23, 2026

First seenJul 23, 2026

Weakness typeCWE-20Improper input validation CWE-502Deserialization of untrusted data

How to fix

Vendor advisories

github.com/alibaba/fastjson2/wiki/Security-Advisory:-Remote-Code-Execution-in-fastjson-1.2.68%E2%80%931.2.83

Affected products

Product	Affected versions	Fixed in
com.alibaba:fastjsonMaven	1.2.68 ≤ v ≤ 1.2.83	—

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