CVE-2026-16723

CRITICALPre-NVD 9.09.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
Elevated

Also known asEUVD-2026-47929 (ENISA EUVD) · GHSA-crf3-v9rr-v7hj (GitHub Security Advisories)Source: ENISA EUVD

9.0EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.0Exploit: Public PoCExposed services: Not assessed

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

The CVE record's CNA (Alibaba, Inc.) lists Alibaba Fastjson versions 1.2.68 up to and including 1.2.83 as affected. No release containing a fix is confirmed on record.

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
9.0CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity90% × 45%
Impact severity (EG Severity): CVSS 9.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.0): severity, escalated by confirmed exploitation. This CVE's 9.0 is its impact severity (EG Severity), not escalated.

EG Severity
9.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 23, 2026

Last Modified

October 24, 2026

Advisory Details (1)

Auto-updated Jul 23, 2026
No fix on record yet.
Web page

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
com.alibaba:fastjson1.2.68 ... 1.2.83 (21 versions)
  • 1.2.68 through 1.2.83: no fix on record
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 60× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 484 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 384 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:51 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-11-12 23:34 UTCEchelonGraph re-scored
  3. 2026-11-12 23:34 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  4. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  5. 2026-11-11 23:13 UTCEchelonGraph re-scored
  6. 2026-11-11 23:13 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  7. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  8. 2026-11-10 22:52 UTCEchelonGraph re-scored
  9. 2026-11-10 22:51 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  10. 2026-11-10 16:42 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  11. 2026-11-09 22:05 UTCEchelonGraph re-scored
  12. 2026-11-09 22:05 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  13. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-11-08 21:42 UTCEchelonGraph re-scored
  15. 2026-11-08 21:42 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  16. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-11-07 21:21 UTCEchelonGraph re-scored
  18. 2026-11-07 21:21 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  19. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  20. 2026-11-06 21:00 UTCEchelonGraph re-scored
  21. 2026-11-06 21:00 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  22. 2026-11-06 16:36 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  23. 2026-11-05 20:39 UTCEchelonGraph re-scored
  24. 2026-11-05 20:39 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  25. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.7% · 51st percentile
Show 75 more
  1. 2026-11-04 20:18 UTCEchelonGraph re-scored
  2. 2026-11-04 20:18 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  3. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  4. 2026-11-03 19:56 UTCEchelonGraph re-scored
  5. 2026-11-03 19:56 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  6. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  7. 2026-11-02 19:35 UTCEchelonGraph re-scored
  8. 2026-11-02 19:35 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  9. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-11-01 19:14 UTCEchelonGraph re-scored
  11. 2026-11-01 19:14 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  12. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-10-31 18:53 UTCEchelonGraph re-scored
  14. 2026-10-31 18:53 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  15. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  16. 2026-10-30 18:31 UTCEchelonGraph re-scored
  17. 2026-10-30 18:31 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  18. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  19. 2026-10-29 18:11 UTCEchelonGraph re-scored
  20. 2026-10-29 18:11 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  21. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  22. 2026-10-28 17:47 UTCEchelonGraph re-scored
  23. 2026-10-28 17:47 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  24. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  25. 2026-10-27 17:24 UTCEchelonGraph re-scored
  26. 2026-10-27 17:24 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  27. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  28. 2026-10-26 17:03 UTCEchelonGraph re-scored
  29. 2026-10-26 17:03 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  30. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  31. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  32. 2026-10-25 16:25 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  33. 2026-10-25 13:49 UTCEchelonGraph re-scored
  34. 2026-10-25 13:48 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  35. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  36. 2026-10-24 13:26 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  37. 2026-10-23 22:53 UTCEchelonGraph re-scored
  38. 2026-10-23 22:53 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  39. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  40. 2026-10-22 22:30 UTCEchelonGraph re-scored
  41. 2026-10-22 22:30 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  42. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  43. 2026-10-21 22:08 UTCEchelonGraph re-scored
  44. 2026-10-21 22:08 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  45. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  46. 2026-10-20 21:43 UTCEchelonGraph re-scored
  47. 2026-10-20 21:43 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  48. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  49. 2026-10-19 21:23 UTCEchelonGraph re-scored
  50. 2026-10-19 21:22 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  51. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  52. 2026-10-18 20:51 UTCEchelonGraph re-scored
  53. 2026-10-18 20:51 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  54. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  55. 2026-10-18 04:00 UTCEchelonGraph re-scored
  56. 2026-10-17 20:13 UTCEchelonGraph re-scored
  57. 2026-10-17 20:12 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  58. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  59. 2026-10-16 19:51 UTCEchelonGraph re-scored
  60. 2026-10-16 19:51 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  61. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  62. 2026-10-15 17:12 UTCEchelonGraph re-scored
  63. 2026-10-15 17:11 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  64. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  65. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  66. 2026-10-14 11:09 UTCEchelonGraph re-scored
  67. 2026-10-14 11:09 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  68. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  69. 2026-10-13 09:56 UTCEchelonGraph re-scored
  70. 2026-10-13 09:56 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  71. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  72. 2026-10-12 16:30 UTCEchelonGraph re-scored
  73. 2026-10-12 09:33 UTCGHSA enrichmentGHSA-crf3-v9rr-v7hj · GitHub severity CRITICAL · GitHub CVSS 9.0
  74. 2026-10-11 20:09 UTCEchelonGraph re-scored
  75. 2026-10-11 17:21 UTCEchelonGraph re-scored

Publicly available exploits

(6 references)

Public exploit code is referenced for this CVE (6 GitHub PoCs). No fix is confirmed yet, so defenders should restrict or isolate affected systems accordingly until one is published.

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

    A critical vulnerability affecting Fastjson versions 1.2.68 – 1.2.83.

    Open source ↗
  • GitHub PoCEQSTLab/CVE-2026-16723
    Published Jul 30, 2026

    Fastjson RCE

    Open source ↗
  • GitHub PoCNowafen/CVE-2026-16723
    Published Jul 30, 2026
    Open source ↗
  • GitHub PoCwhy-success/fastjson-rce-lab
    Published Jul 28, 2026

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

    Open source ↗
  • GitHub PoCdinosn/fastjson-jsontype-rce-lab
    Published 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 ↗

Frequently asked(5)

What is CVE-2026-16723?
CVE-2026-16723 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-16723 published?
The CVE record for CVE-2026-16723 was published on July 23, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-16723 actively exploited?
CVE-2026-16723 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16723?
CVE-2026-16723 has a CVSS base score of 9.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-16723?
No fix for CVE-2026-16723 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (Alibaba, Inc.) lists Alibaba Fastjson versions 1.2.68 up to and including 1.2.83 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-16723 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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