# GHSA-6wj5-5pgr-jwq8: Open WebUI Unauthenticated Multipart Boundary Denial of Service (DoS) Vulnerability in api/chat/file

> Unauthenticated attackers can cause a Denial of Service in Open WebUI by uploading files with malformed multipart boundaries, rendering the application inaccessible.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 20 Mar 2025

## What is GHSA-6wj5-5pgr-jwq8?

GHSA-6wj5-5pgr-jwq8 is a denial of service vulnerability in open-webui, published on 20 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in open-webui/open-webui version 79778fa allows an attacker to cause a Denial of Service (DoS) by uploading a file with a malformed multipart boundary. By appending a large number of characters to the end of the multipart boundary, the server continuously processes each character, rendering the application inaccessible. This issue can prevent all users from accessing the application until the server recovers.

## Which versions are affected by GHSA-6wj5-5pgr-jwq8?

2 open source packages ship an affected version, including open-webui.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `open-webui` | PyPI | All versions | 0.4.7 |
| `open-webui` | PyPI | All versions | 0.4.7 |

## How do I fix GHSA-6wj5-5pgr-jwq8?

Upgrade open-webui to 0.4.7 or later.

## Is GHSA-6wj5-5pgr-jwq8 being exploited?

There is no known exploitation of GHSA-6wj5-5pgr-jwq8 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-6wj5-5pgr-jwq8 and fix it if it is affected.

What it is: GHSA-6wj5-5pgr-jwq8 is a denial of service vulnerability in open-webui, published on 20 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of GHSA-6wj5-5pgr-jwq8 in the wild and no public exploit code.

Affected packages and fixed versions:
- open-webui (PyPI): affected all versions; fixed in 0.4.7
- open-webui (PyPI): affected all versions; fixed in 0.4.7

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/GHSA-6wj5-5pgr-jwq8/ (Markdown: https://insights.sbomify.com/GHSA-6wj5-5pgr-jwq8/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-6wj5-5pgr-jwq8

---
From sbomify Insights: https://insights.sbomify.com/GHSA-6wj5-5pgr-jwq8/
Summaries are generated and may contain mistakes; the official description above is the record.