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Exploitation reportedNot in CISA KEV yet

CVE-2026-16723

Exploitation reported by one source. First attested on 2026-07-25 by GCVE · kevintel.

  • Published2026-07-23
  • WeaknessCWE-20 · CWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-07-2309:16CVE publishedNVD
  2. 2026-07-2502:23Listed as exploited by GCVEGCVE
  3. 2026-07-2502:23Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-16723?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-16723?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV
fastjson
BranchAffectedFixed in
1.2≥ 1.2.68, ≤ 1.2.83no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As alibaba, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Alibaba Fastjsonother versions: not affected
    Affected
    • ≥ 1.2.68, ≤ 1.2.83no fix statedcustom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-07-23

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-16723 Red Hat Product Security

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

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
14 repositories, unverifieddinosn/fastjson-jsontype-rce-labHORKimhab/CVE-2026-16723why-success/fastjson-rce-labEQSTLab/CVE-2026-167231xPwn/CVE-2026-16723
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
2026-07-23
Last Modified
2026-10-24
NVD status
Deferred
GitHub Advisory
GHSA-crf3-v9rr-v7hj

Frequently asked questions

What is CVE-2026-16723?

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.

Is CVE-2026-16723 actively exploited?

Active exploitation of CVE-2026-16723 has not been confirmed. Its EPSS score was 0.7% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-16723?

CVE-2026-16723 has a CVSS v3 base score of 9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

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Sources for this record