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9.0

Fastjson Remote Code Execution Vulnerability

CVE-2026-16723 · published 3 months ago
Summary

Fastjson versions 1.2.68 to 1.2.83 are vulnerable to a serious security risk. This means an attacker could potentially take control of your system by sending malicious data. You should update to a fixed version of fastjson as soon as possible.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
Ecosystem VendorProductAffected versions
– alibaba fastjson <= 1.2.83
maven alibaba com.alibaba:fastjson >= 1.2.68, <= 1.2.83
Original advisory text
fastjson has a remote code execution (RCE) vulnerability
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.0 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-20Improper Input Validation
CWE-502Deserialization of Untrusted Data
Timeline
Published23 Jul 2026
Updated30 Oct 2026
First seen23 Jul 2026
Sources
CVE-2026-16723 · NVD
CVE-2026-16723 · MITRE
GHSA-crf3-v9rr-v7hj · GHSA
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