CVE-2026-90584

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-13. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

A weakness has been identified in TooTallNate Java-WebSocket up to 1.6.1. The impacted element is the function processFrameContinuousAndNonFin of the file Draft_6455.java of the component Fragmentation Handler. Executing a manipulation can lead to allocation of resources. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The pull request to fix this issue awaits acceptance.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

September 13, 2026

Last Modified

September 14, 2026

Advisory Details (3)

Auto-updated Sep 13, 2026
No patch confirmed yet. Sources: github_pr.
generic

GitHub - TooTallNate/Java-WebSocket: A barebones WebSocket client and server implementation written in 100% Java. · GitHub

https://github.com/TooTallNate/Java-WebSocket/
github_pr

fix(draft): cap default maxFrameSize and enforce before allocation

Upstream fix in progress (PR #1509 · TooTallNate/Java-WebSocket, state=open)

https://github.com/TooTallNate/Java-WebSocket/pull/1509
generic

# Security Audit Report: Java-WebSocket (TooTallNate) · Issue #1508 · TooTallNate/Java-WebSocket · GitHub

https://github.com/TooTallNate/Java-WebSocket/issues/1508

Vendor Advisories for CVE-2026-90584(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 26× in last 7d / 26× 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. 2026-09-19 17:04 UTCEG score recompute
  2. 2026-09-19 17:04 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 18:19 UTCGHSA enrichment
  5. 2026-09-17 19:34 UTCEG score recompute
  6. 2026-09-17 19:34 UTCGHSA enrichment
  7. 2026-09-17 19:32 UTCEPSS rescore
  8. 2026-09-16 18:36 UTCEG score recompute
  9. 2026-09-16 18:35 UTCGHSA enrichment
  10. 2026-09-16 14:09 UTCEPSS rescore
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 19:51 UTCEG score recompute
  13. 2026-09-15 19:51 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-14 21:06 UTCEG score recompute
  16. 2026-09-14 21:06 UTCGHSA enrichment
  17. 2026-09-14 17:28 UTCEG score recompute
  18. 2026-09-14 17:28 UTCGHSA enrichment
  19. 2026-09-14 17:26 UTCNVD updateCVSS v4 → 5.5
  20. 2026-09-14 17:05 UTCEG score recompute
  21. 2026-09-14 17:05 UTCGHSA enrichment
  22. 2026-09-14 17:04 UTCMITRE cvelistV5CVSS v4 → 6.9
  23. 2026-09-13 21:19 UTCEG score recompute
  24. 2026-09-13 21:18 UTCNVD updateCVSS v4 → 5.5
  25. 2026-09-13 20:24 UTCEG score recompute
Show 1 more
  1. 2026-09-13 20:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90584?
CVE-2026-90584 is a medium vulnerability published on September 13, 2026. A weakness has been identified in TooTallNate Java-WebSocket up to 1.6.1. The impacted element is the function processFrameContinuousAndNonFin of the file Draft_6455.java of the component Fragmentation Handler. Executing a manipulation can lead to allocation of resources. The attack may be…
When was CVE-2026-90584 disclosed?
CVE-2026-90584 was first published in the National Vulnerability Database on September 13, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90584 actively exploited?
CVE-2026-90584 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 64.2% of all scored CVEs.
What is the CVSS score of CVE-2026-90584?
CVE-2026-90584 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-90584?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90584, 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

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