HIGH 7.5

PYSEC-2026-1723

Open WebUI denial of service through endpoint for converting markdown

Quick fix

PYSEC-2026-1723 — open-webui: upgrade to the fixed version with the command below.

pip install --upgrade 'open-webui>=0.5.13'

Details

In version 0.3.8 of open-webui, an endpoint for converting markdown to HTML is exposed without authentication. A maliciously crafted markdown payload can cause the server to spend excessive time converting it, leading to a denial of service. The server becomes unresponsive to other requests until the conversion is complete.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / open-webui

Introduced in: 0 Fixed in: 0.5.13

Fix pip install --upgrade 'open-webui>=0.5.13'

References

https://nvd.nist.gov/vuln/detail/CVE-2024-7983 [ADVISORY]
https://github.com/open-webui/open-webui [PACKAGE]
https://github.com/open-webui/open-webui/blob/eff736acd2e0bbbdd0eeca4cc209b216a1f23b6a/backend/apps/webui/routers/utils.py#L49 [WEB]
https://huntr.com/bounties/f8156ca5-1328-480f-a72b-8d3dfdad87dc [WEB]
https://pypi.org/project/open-webui [PACKAGE]
https://github.com/advisories/GHSA-5v9m-57mq-qc75 [ADVISORY]
https://github.com/open-webui/open-webui/commit/2f75eef499cc5cb48deb639cebebf86c405640bd [FIX]