CVE-2026-90584 TooTallNate Java-WebSocket Fragmentation Draft_6455.java processFrameContinuousAndNonFin allocation of resources
Remote attackers can cause resource exhaustion and denial of service in the Java-WebSocket library via crafted fragmentation frames.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90584?
CVE-2026-90584 is a medium-severity denial of service vulnerability in TooTallNate Java-WebSocket, published on 13 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-90584?
How do I fix CVE-2026-90584?
No fix has been published for CVE-2026-90584 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-90584 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90584 exists.
Sources
Also known as GHSA-9rqx-8vr7-9c9f.