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High, CVSS 7.5amended

Open WebUI has vulnerable dependency on starlette via fastapi

GHSA-w466-2wfc-8g58

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (open-webui 0.5.8), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from osv record GHSA-w466-2wfc-8g58

  2. Revision 3 · amended ·

    Amended from ghsa record GHSA-w466-2wfc-8g58

  3. Revision 2 · amended ·

    Amended from ghsa record GHSA-w466-2wfc-8g58

  4. Revision 1 · created ·

    Published from osv record GHSA-w466-2wfc-8g58

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-w466-2wfc-8g58

Advisory: Open WebUI has vulnerable dependency on starlette via fastapi
IDs: GHSA-w466-2wfc-8g58
Record: https://patchnext.com/advisories/ghsa-w466-2wfc-8g58 (revision 4, source checked 27 Oct 2026, 06:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.5.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected < 0.5.8; fixed in 0.5.8

## Suggested inspection (read-only)
- `python -m pip show open-webui`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on open-webui.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-w466-2wfc-8g58 (OSV record GHSA-w466-2wfc-8g58 lists affected ranges: PyPI open-webui >=0 <=0.3.32)
- Verified: https://github.com/advisories/GHSA-w466-2wfc-8g58 (GitHub-reviewed advisory GHSA-w466-2wfc-8g58 lists affected ranges: PyPI open-webui >=0 <=0.3.32)
- Verified: https://github.com/advisories/GHSA-w466-2wfc-8g58 (GitHub-reviewed advisory GHSA-w466-2wfc-8g58 lists affected ranges: PyPI open-webui >=0 <0.5.8)
- Verified: https://osv.dev/vulnerability/GHSA-w466-2wfc-8g58 (OSV record GHSA-w466-2wfc-8g58 lists affected ranges: PyPI open-webui >=0 <0.5.8 (fixed))

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