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.
Advisories
Source ID Title
EUVD EUVD EUVD-2025-6928 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.
Github GHSA Github GHSA GHSA-5v9m-57mq-qc75 Open WebUI denial of service through endpoint for converting markdown
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 15 Oct 2025 13:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Wed, 15 Oct 2025 13:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770

Mon, 21 Jul 2025 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Openwebui
Openwebui open Webui
CPEs cpe:2.3:a:openwebui:open_webui:0.3.8:*:*:*:*:*:*:*
Vendors & Products Openwebui
Openwebui open Webui

Thu, 20 Mar 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 20 Mar 2025 10:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Denial of Service in open-webui/open-webui
Weaknesses CWE-400
References
Metrics cvssV3_0

{'score': 7.5, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: @huntr_ai

Published:

Updated: 2025-10-15T12:49:52.820Z

Reserved: 2024-08-19T19:56:05.043Z

Link: CVE-2024-7983

cve-icon Vulnrichment

Updated: 2025-03-20T17:51:10.788Z

cve-icon NVD

Status : Modified

Published: 2025-03-20T10:15:38.387

Modified: 2025-10-15T13:15:53.130

Link: CVE-2024-7983

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-07-13T11:31:29Z