# CVE-2026-23538: Feast: resource exhaustion via websocket endpoint

> Remote attackers can cause denial of service by exhausting server resources through unauthenticated WebSocket connections in Feast Feature Server.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Jul 2026
- **Updated:** 16 Jul 2026
- **Also known as:** GHSA-gmv6-fcfc-3372

## What is CVE-2026-23538?

CVE-2026-23538 is a high-severity denial of service vulnerability in Feast Feature Server, published on 16 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was identified in the Feast Feature Server's `/ws/chat` endpoint that allows remote attackers to establish persistent WebSocket connections without any authentication. By opening a large number of simultaneous connections, an attacker can exhaust server resources—such as memory, CPU, and file descriptors—leading to a complete denial of service for legitimate users.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2026-23538?


## How do I fix CVE-2026-23538?

No fix has been published for CVE-2026-23538 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23538 being exploited?

There is no known exploitation of CVE-2026-23538 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23538 and fix it if it is affected.

What it is: CVE-2026-23538 is a high-severity denial of service vulnerability in Feast Feature Server, published on 16 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-23538 in the wild and no public exploit code.

Affected product: Feast Feature Server. 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-2026-23538/ (Markdown: https://insights.sbomify.com/CVE-2026-23538/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23538
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23538
- OSV: https://osv.dev/vulnerability/CVE-2026-23538

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23538/
Summaries are generated and may contain mistakes; the official description above is the record.