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.

References

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

https://www.securityweek.com/unpatched-fastjson-vulnerability-exploited-in-attacks/

https://thehackernews.com/2026/07/attackers-exploit-arista-velocloud.html

https://www.bleepingcomputer.com/news/security/hackers-target-us-firms-in-fastjson-rce-zero-day-attacks/

https://thehackernews.com/2026/07/fastjson-1x-rce-vulnerability-targeted.html

https://latesthackingnews.com/2026/07/26/fastjson-rce-vulnerability-how-to-check/

https://github.com/ipisav/fastjson-cve

https://github.com/bangbang3kyu/CVE-Hands-On

https://github.com/Superman-L/CVE-2026-16723

https://github.com/learner330/fastjson-cve-2026-16723

https://github.com/xiaoqiMikko/fastjson-check

https://github.com/fazilbaig1/CVE-2026-16723

https://github.com/Nowafen/CVE-2026-16723

https://github.com/1xPwn/CVE-2026-16723

https://github.com/HORKimhab/CVE-2026-16723

https://github.com/dinosn/fastjson-jsontype-rce-lab

Details

Source: Mitre, NVD

Published: 2026-07-23

Updated: 2026-07-23

Risk Information

CVSS v2

Base Score: 7.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 9

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

Severity: Critical

EPSS

EPSS: 0.15989

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics