# GHSA-5ccf-884p-4jjq: Open WebUI Unauthenticated Multipart Boundary Denial of Service (DoS) Vulnerability

> Unauthenticated attackers can cause denial of service in Open WebUI by sending crafted multipart requests that exhaust server resources.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Mar 2025

## What is GHSA-5ccf-884p-4jjq?

GHSA-5ccf-884p-4jjq 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 Denial of Service (DoS) vulnerability exists in open-webui/open-webui version 0.3.21. This vulnerability affects multiple endpoints, including `/ollama/models/upload`, `/audio/api/v1/transcriptions`, and `/rag/api/v1/doc`. The application processes multipart boundaries without authentication, leading to resource exhaustion. By appending additional characters to the multipart boundary, an attacker can cause the server to parse each byte of the boundary, ultimately leading to service unavailability. This vulnerability can be exploited remotely, resulting in high CPU and memory usage, and rendering the service inaccessible to legitimate users.

## Which versions are affected by GHSA-5ccf-884p-4jjq?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `open-webui` | PyPI | All versions to 0.3.21 | None |
| `open-webui` | PyPI | All versions to 0.3.21 | None |
| `open-webui` | npm | All versions to 0.3.21 | None |
| `open-webui` | npm | All versions to 0.3.21 | None |

## How do I fix GHSA-5ccf-884p-4jjq?

No fix has been published for GHSA-5ccf-884p-4jjq yet. Limit exposure of the affected software until one is available.

## Is GHSA-5ccf-884p-4jjq being exploited?

There is no known exploitation of GHSA-5ccf-884p-4jjq in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-5ccf-884p-4jjq and fix it if it is affected.

What it is: GHSA-5ccf-884p-4jjq 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-5ccf-884p-4jjq in the wild and no public exploit code.

Affected packages and fixed versions:
- open-webui (PyPI): affected all versions up to 0.3.21; no fix listed
- open-webui (PyPI): affected all versions up to 0.3.21; no fix listed
- open-webui (npm): affected all versions up to 0.3.21; no fix listed
- open-webui (npm): affected all versions up to 0.3.21; no fix listed

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-5ccf-884p-4jjq/ (Markdown: https://insights.sbomify.com/GHSA-5ccf-884p-4jjq/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-5ccf-884p-4jjq

---
From sbomify Insights: https://insights.sbomify.com/GHSA-5ccf-884p-4jjq/
Summaries are generated and may contain mistakes; the official description above is the record.