CVE-2026-90584

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.72% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 53.5% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-09-14.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-13 20:15Z1 MO AGO

Last updated

2026-09-14 17:00Z1 MO AGO

Reserved

2026-09-12

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass
• CWE-770Allocation of Resources Without Limits or ThrottlingBase

Data version

5.2

Document digest

17563bbb3768b1c297f1937a04b2c8afa9d4d7130daf58669538d2fd2f6c729e

• vuldb.comVDB-403169 | TooTallNate Java-WebSocket Fragmentation Draft_6455.java processFrameContinuousAndNonFin allocation of resourceshttps://vuldb.com/vuln/403169vdb-entrytechnical-description
• vuldb.comVDB-403169 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/403169/ctisignaturepermissions-required
• vuldb.comCVE-2026-90584 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-90584third-party-advisory
• vuldb.comSubmit #913786 | TooTallNate Java-WebSocket 1.6.0 Allocation of Resources Without Limits or Throttlinghttps://vuldb.com/submit/913786third-party-advisory
• github.comhttps://github.com/TooTallNate/Java-WebSocket/issues/1508exploitissue-tracking
• github.comhttps://github.com/TooTallNate/Java-WebSocket/pull/1509issue-trackingpatch
• github.comhttps://github.com/TooTallNate/Java-WebSocket/product