CVE-2026-16723

Remote Code Execution in fastjson 1.2.68–1.2.83

State: Published
Severity: 9.0 Critical
Published: Jul 23, 2026
Updated: Jul 23, 2026
Reserved: Jul 23, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.0 Critical	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H	alibaba

Weaknesses

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

Affected Products

Product	Versions
FastjsonAlibaba	1.2.68 through 1.2.83Affected

References

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

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