Open WebUI denial of service through endpoint for converting markdown
Date: 2025-03
Affected: pip/open-webui
Attack vector: dos
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2024-7983
CWE: CWE-400
CWE-770
CVSS: 7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

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.


Mitigations:

Architectural layers (MAESTRO):