CVE-2026-16723

CRITICAL 9.0

Remote Code Execution in fastjson 1.2.68–1.2.83

CVSS Score

9.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-20 CWE-502
Vendor	alibaba
Product	fastjson
Published	Jul 23, 2026

Stay Ahead of the Next One

Get instant alerts for alibaba fastjson

Be the first to know when new critical vulnerabilities affecting alibaba fastjson are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Alibaba / Fastjson

1.2.68 ≤ 1.2.83

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Kirill Firsov of FearsOff Cybersecurity