CVE-2026-16723

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreMEDIUM 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 — 3 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: 16%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(medium)
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
16%
EPSS %ILE
97%
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.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
mavencom.alibaba:fastjson—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
com.alibaba:fastjson1.2.68 ... 1.2.83 (21 versions)——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 31× in last 7d / 149× 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.

Showing the most recent 100 of 328 total refreshes for this CVE.

  1. 2026-09-14 16:42 UTCGHSA enrichment
  2. 2026-09-14 10:45 UTCGHSA enrichment
  3. 2026-09-14 06:36 UTCGHSA enrichment
  4. 2026-09-14 02:31 UTCGHSA enrichment
  5. 2026-09-13 22:25 UTCGHSA enrichment
  6. 2026-09-13 17:43 UTCEG score recompute
  7. 2026-09-13 17:43 UTCGHSA enrichment
  8. 2026-09-13 16:46 UTCEPSS rescore
  9. 2026-09-13 13:37 UTCGHSA enrichment
  10. 2026-09-13 09:32 UTCGHSA enrichment
  11. 2026-09-13 05:26 UTCGHSA enrichment
  12. 2026-09-13 01:21 UTCGHSA enrichment
  13. 2026-09-12 20:52 UTCGHSA enrichment
  14. 2026-09-12 16:38 UTCEG score recompute
  15. 2026-09-12 16:38 UTCGHSA enrichment
  16. 2026-09-12 15:00 UTCEPSS rescore
  17. 2026-09-12 12:31 UTCGHSA enrichment
  18. 2026-09-12 06:38 UTCGHSA enrichment
  19. 2026-09-12 02:03 UTCGHSA enrichment
  20. 2026-09-11 21:57 UTCGHSA enrichment
  21. 2026-09-11 17:51 UTCEG score recompute
  22. 2026-09-11 17:51 UTCGHSA enrichment
  23. 2026-09-11 14:52 UTCEPSS rescore
  24. 2026-09-11 09:36 UTCEPSS rescore
  25. 2026-09-11 07:23 UTCGHSA enrichment
Show 75 more
  1. 2026-09-11 03:16 UTCGHSA enrichment
  2. 2026-09-10 21:10 UTCEG score recompute
  3. 2026-09-10 21:10 UTCGHSA enrichment
  4. 2026-09-10 09:34 UTCEPSS rescore
  5. 2026-09-09 09:08 UTCEG score recompute
  6. 2026-09-09 09:08 UTCGHSA enrichment
  7. 2026-09-08 22:00 UTCEPSS rescore
  8. 2026-09-08 01:44 UTCGHSA enrichment
  9. 2026-09-07 21:38 UTCGHSA enrichment
  10. 2026-09-06 16:49 UTCEG score recompute
  11. 2026-09-06 16:49 UTCGHSA enrichment
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-06 12:43 UTCGHSA enrichment
  14. 2026-09-06 08:37 UTCGHSA enrichment
  15. 2026-09-06 03:43 UTCGHSA enrichment
  16. 2026-09-05 23:38 UTCGHSA enrichment
  17. 2026-09-05 19:32 UTCEG score recompute
  18. 2026-09-05 19:32 UTCGHSA enrichment
  19. 2026-09-05 07:05 UTCGHSA enrichment
  20. 2026-09-04 17:46 UTCEG score recompute
  21. 2026-09-04 17:46 UTCGHSA enrichment
  22. 2026-09-04 13:38 UTCEG score recompute
  23. 2026-09-04 13:38 UTCGHSA enrichment
  24. 2026-09-04 05:06 UTCEPSS rescore
  25. 2026-09-02 14:11 UTCEPSS rescore
  26. 2026-09-01 23:27 UTCEG score recompute
  27. 2026-09-01 23:27 UTCGHSA enrichment
  28. 2026-09-01 13:53 UTCEPSS rescore
  29. 2026-09-01 04:39 UTCEPSS rescore
  30. 2026-08-31 07:54 UTCGHSA enrichment
  31. 2026-08-31 02:59 UTCGHSA enrichment
  32. 2026-08-30 22:52 UTCEG score recompute
  33. 2026-08-30 22:52 UTCGHSA enrichment
  34. 2026-08-30 19:17 UTCEPSS rescore
  35. 2026-08-30 18:47 UTCGHSA enrichment
  36. 2026-08-30 14:41 UTCGHSA enrichment
  37. 2026-08-30 10:27 UTCGHSA enrichment
  38. 2026-08-30 04:54 UTCEG score recompute
  39. 2026-08-30 04:54 UTCGHSA enrichment
  40. 2026-08-30 01:22 UTCEPSS rescore
  41. 2026-08-30 00:46 UTCEG score recompute
  42. 2026-08-30 00:46 UTCGHSA enrichment
  43. 2026-08-28 21:41 UTCEPSS rescore
  44. 2026-08-28 01:32 UTCGHSA enrichment
  45. 2026-08-27 21:09 UTCGHSA enrichment
  46. 2026-08-27 14:27 UTCEG score recompute
  47. 2026-08-27 14:26 UTCGHSA enrichment
  48. 2026-08-27 14:25 UTCEPSS rescore
  49. 2026-08-27 10:15 UTCGHSA enrichment
  50. 2026-08-27 04:47 UTCGHSA enrichment
  51. 2026-08-27 00:03 UTCGHSA enrichment
  52. 2026-08-26 19:57 UTCEG score recompute
  53. 2026-08-26 19:57 UTCGHSA enrichment
  54. 2026-08-26 14:46 UTCEPSS rescore
  55. 2026-08-26 11:55 UTCGHSA enrichment
  56. 2026-08-26 07:49 UTCGHSA enrichment
  57. 2026-08-26 03:39 UTCGHSA enrichment
  58. 2026-08-25 23:33 UTCGHSA enrichment
  59. 2026-08-25 18:58 UTCGHSA enrichment
  60. 2026-08-25 14:52 UTCEG score recompute
  61. 2026-08-25 14:52 UTCGHSA enrichment
  62. 2026-08-25 13:48 UTCEPSS rescore
  63. 2026-08-25 10:47 UTCGHSA enrichment
  64. 2026-08-25 06:42 UTCGHSA enrichment
  65. 2026-08-25 02:23 UTCGHSA enrichment
  66. 2026-08-24 22:18 UTCGHSA enrichment
  67. 2026-08-24 18:13 UTCEG score recompute
  68. 2026-08-24 18:13 UTCGHSA enrichment
  69. 2026-08-24 13:28 UTCEG score recompute
  70. 2026-08-24 13:28 UTCGHSA enrichment
  71. 2026-08-24 09:22 UTCGHSA enrichment
  72. 2026-08-24 05:15 UTCGHSA enrichment
  73. 2026-08-24 01:09 UTCGHSA enrichment
  74. 2026-08-23 21:04 UTCGHSA enrichment
  75. 2026-08-23 16:58 UTCGHSA enrichment

Publicly available exploits

(5 references)

Working exploit code is in the public domain (5 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoClearner330/fastjson-cve-2026-16723
    First seen Aug 5, 2026
    Open source ↗
  • GitHub PoCNowafen/CVE-2026-16723
    First seen Jul 30, 2026
    Open source ↗
  • GitHub PoC1xPwn/CVE-2026-16723
    First seen Jul 30, 2026

    A critical vulnerability affecting Fastjson versions 1.2.68 – 1.2.83.

    Open source ↗
  • GitHub PoCwhy-success/fastjson-rce-lab
    First seen Jul 28, 2026

    Fastjson 1.2.83 RCE 靶场环境 (CVE-2026-16723)

    Open source ↗
  • 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 16% probability of exploitation in the next 30 days, which ranks it in the top 3.3% 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-16723

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