# 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.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-9rqx-8vr7-9c9f

## 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.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling), CWE-400 (Uncontrolled Resource Consumption)

## 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.

## Is CVE-2026-90584 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90584 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90584 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90584 exists.

Affected product: TooTallNate Java-WebSocket. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-90584/ (Markdown: https://insights.sbomify.com/CVE-2026-90584/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90584
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90584
- OSV: https://osv.dev/vulnerability/CVE-2026-90584

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90584/
Summaries are generated and may contain mistakes; the official description above is the record.