CVE-2026-16723CWE-20CWE-502

Remote Code Execution in fastjson 1.2.68–1.2.83

Critical · published July 23, 2026

CVSS v3.1
9.0
EPSS
1%
Percentile
51.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00663 · 51.1th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-502 · Deserialization of Untrusted Data
Published
2026-07-23T08:26Z
EPSS history
Timeline
  • 25 SEP 03:24Z
    EPSS moved 16% → 1%
    epss
  • 23 JUL 08:26Z
    Remote Code Execution in fastjson 1.2.68–1.2.83
    cvelistv5