PT-2026-56829 · Openwebui · Open-Webui

Published 2026-07-09 · Updated 2026-07-09 · CVE-2026-59220

NVD

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.2 before 0.10.0, the SKILL MENTION RE and strip re regular expressions in backend/open webui/utils/middleware.py parsed <$skillId|label> skill mentions with overlapping quantifiers, allowing an authenticated chat message containing <$ without a closing > to trigger quadratic backtracking and block the asyncio event loop. This issue is fixed in version 0.10.0.

Fix

DoS

Weakness Enumeration

CWE-1333

Related Identifiers

CVE-2026-59220

Affected Products

Open-Webui

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-59220 · Security Note
• https://github.com/open-webui/open-webui/commit/61a26722155ec6ee1b629cf8dfcf975098c18331 · Note
• https://github.com/open-webui/open-webui/security/advisories/GHSA-ffpj-xv5c-p3gw · Note
• https://github.com/open-webui/open-webui/releases/tag/v0.10.0 · Note