Vulnerability DatabaseCVE-2026-16723
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CVE-2026-16723
Published:July 23, 2026
Updated:August 06, 2026
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. As there is no fix for 1.x branch, users should upgrade to versions 2.x and above that are not affected by this issue.
Affected Packages
com.alibaba:fastjson (JAVA):
Affected version(s) >=1.2.68 <2.0.0
Fix Suggestion:
Update to version 2.0.0
Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (1)
https://github.com/alibaba/fastjson2/wiki/Security-Advisory:-Remote-Code-Execution-in-fastjson-1.2.68%E2%80%931.2.83
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CVSS v4
Base Score:
9.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Deserialization of Untrusted Data
CWE-502
Improper Input Validation
CWE-20
EPSS
Base Score:
0.41