CVE-2026-16723: Remote Code Execution in fastjson 1.2.68–1.2.83
Published Jul 23, 2026
·Updated
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 Software
1 affected component
fastjson>=1.2.68<=1.2.83
Event History
Jul 23, 2026
CVE Published
via MITRE·08:26 AM
Data Sourced
via MITRE·08:26 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·09:16 AM
DescriptionSeverityWeakness
Frequently Asked Questions
1
What is the severity of CVE-2026-16723?
CVE-2026-16723 has a severity rating of critical with a score of 9.
2
How do I fix CVE-2026-16723?
To mitigate CVE-2026-16723, upgrade fastjson to version 1.2.84 or later.
3
What is the impact of CVE-2026-16723?
CVE-2026-16723 allows for remote code execution, enabling attackers to execute arbitrary code in vulnerable applications.
4
Which versions of fastjson are affected by CVE-2026-16723?
CVE-2026-16723 affects fastjson versions 1.2.68 through 1.2.83.
5
Is AutoType enablement required to exploit CVE-2026-16723?
No, CVE-2026-16723 is exploitable without AutoType enablement and without the need for any classpath gadgets.