CVE-2026-16723

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreHIGH confidence

Score 9.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-23. a secondary CVSS source baseline 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.0Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.0
EG Score
9.0(high)
EG Risk
57(Track)
EG Risk 57/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

July 23, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Jul 23, 2026
No patch confirmed yet.
generic

Security Advisory: Remote Code Execution in fastjson 1.2.68–1.2.83 · alibaba/fastjson2 Wiki · GitHub

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

Vendor Advisories for CVE-2026-16723(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 36× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-29 17:28 UTCGHSA enrichment
  2. 2026-07-29 13:23 UTCGHSA enrichment
  3. 2026-07-29 09:17 UTCGHSA enrichment
  4. 2026-07-29 05:11 UTCGHSA enrichment
  5. 2026-07-29 01:05 UTCGHSA enrichment
  6. 2026-07-28 20:58 UTCGHSA enrichment
  7. 2026-07-28 16:50 UTCEG score recompute
  8. 2026-07-28 16:49 UTCGHSA enrichment
  9. 2026-07-28 11:43 UTCGHSA enrichment
  10. 2026-07-28 07:33 UTCGHSA enrichment
  11. 2026-07-28 03:27 UTCGHSA enrichment
  12. 2026-07-27 23:20 UTCGHSA enrichment
  13. 2026-07-27 19:13 UTCGHSA enrichment
  14. 2026-07-27 15:07 UTCEG score recompute
  15. 2026-07-27 15:07 UTCGHSA enrichment
  16. 2026-07-27 14:13 UTCEPSS rescore
  17. 2026-07-27 10:39 UTCGHSA enrichment
  18. 2026-07-27 06:32 UTCGHSA enrichment
  19. 2026-07-27 02:25 UTCGHSA enrichment
  20. 2026-07-26 22:18 UTCGHSA enrichment
  21. 2026-07-26 18:11 UTCEG score recompute
  22. 2026-07-26 18:11 UTCGHSA enrichment
  23. 2026-07-26 14:54 UTCEPSS rescore
  24. 2026-07-26 14:54 UTCEPSS rescore
  25. 2026-07-26 13:53 UTCEG score recompute
Show 11 more
  1. 2026-07-26 13:53 UTCGHSA enrichment
  2. 2026-07-26 09:46 UTCGHSA enrichment
  3. 2026-07-26 03:19 UTCEG score recompute
  4. 2026-07-26 03:19 UTCGHSA enrichment
  5. 2026-07-25 14:17 UTCEPSS rescore
  6. 2026-07-25 14:17 UTCEPSS rescore
  7. 2026-07-24 14:17 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 14:18 UTCEPSS rescore
  10. 2026-07-23 08:35 UTCEG score recompute
  11. 2026-07-23 08:34 UTCMITRE cvelistV5first tracked

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCdinosn/fastjson-jsontype-rce-lab
    First seen Jul 20, 2026

    Docker labs + defensive scanner for fastjson remote-class-load RCE. fastjson 1.2.66-1.2.83: @JSONType resource probe (CVE-2026-16723). fastjson2 2.0.57: attacker @type reaches loadClass with autoType DISABLED via polymorphic types (@JSONType(seeAlso) / Jackson @JsonSubTypes). Marker-only payloads; safeMode + JDK17 controls.

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16723?
CVE-2026-16723 is a critical vulnerability published on July 23, 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.
When was CVE-2026-16723 disclosed?
CVE-2026-16723 was first published in the National Vulnerability Database on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16723 actively exploited?
CVE-2026-16723 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.1% of all scored CVEs.
What is the CVSS score of CVE-2026-16723?
CVE-2026-16723 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-16723?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16723, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-16723

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