CVE-2026-109295

Medium

Description

Open WebUI from 0.11.0 before 0.11.4 contains a regular expression denial of service vulnerability that allows authenticated users to stall server workers via file search patterns. Attackers can instruct the model to call grep_knowledge_files or grep_chat_files with a catastrophically backtracking regex, blocking the event loop for two seconds per repeated call.

SeverityMedium

CVSS4.3

Exploit probability—

ProductOpen-webui

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-1333CWE-1333

How to fix

Update

open-webui open-webui0.11.4 or later

Vendor advisories

github.com/open-webui/open-webui/security/advisories/GHSA-gfjp-5hc9-852r

Affected products

Product	Affected versions	Fixed in
open-webui open-webui	0.11.0 ≤ v < 0.11.4	0.11.4

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