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.
Published: 2025-03-20
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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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
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'}


Subscriptions

Open-webui Open-webui
Openwebui Open Webui
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

Weaknesses