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Fencer Vulns
critical 9.0

CVE-2026-16723 json

Remote Code Execution in fastjson 1.2.68–1.2.83

published 2026-07-23 3 mo ago modified 2026-10-24 16 d ago also GHSA-crf3-v9rr-v7hj , EUVD-2026-47929

cvss
9.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-16723 updated cvss 9.0

com.alibaba/fastjson: Fastjson: Remote Code Execution vulnerability without special configuration

  • Red Hat build of Debezium 3 fastjson 1.2.83 Red Hat JBoss Enterprise Application Platform Expansion Pack fastjson 1.2.83
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
GitHub 3.1 9.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven com.alibaba:fastjson
>=1.2.68, <=1.2.83
 no fix listed

Affected products

  • Alibaba Fastjson

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.