CVE-2026-109298

Medium

Description

Open WebUI 0.11.0 before 0.11.4 compiles user-chosen grep patterns for its knowledge and chat file search tools with a regex engine that expands nested counted repetition unbounded at compile time and caches the result. Authenticated users can have the model call grep_knowledge_files with short nested-repetition patterns, blocking the event loop and exhausting worker memory.

SeverityMedium

CVSS6.5

Exploit probability—

ProductOpen-webui

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-400Uncontrolled resource consumption CWE-770Allocation of resources without limits

How to fix

Update

open-webui open-webui0.11.4 or later

Patches

github.com/open-webui/open-webui/commit/97e013a66169c4fcd7f26ab9e41a4ff260ffd4da

Vendor advisories

github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh

Affected products

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

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.