CVE-2026-109299

Medium

Description

Open WebUI from 0.9.0 before 0.11.4 contains a denial of service vulnerability that allows authenticated users with automations permission to stall the instance by submitting unsatisfiable recurrence rules. Attackers can repeatedly send rules like February 30th to the automations create or update endpoints, blocking the shared event loop for seconds per request.

SeverityMedium

CVSS6.5

Exploit probability—

ProductOpen-webui

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-400Uncontrolled resource consumption CWE-834CWE-834

How to fix

Update

open-webui open-webui0.11.4 or later

Patches

github.com/open-webui/open-webui/commit/5fb869db221d9599a576e8e2eea9c3314947d25e

Vendor advisories

github.com/open-webui/open-webui/security/advisories/GHSA-5w58-mwmh-vf2m

Affected products

Product	Affected versions	Fixed in
open-webui open-webui	0.9.0 ≤ v < 0.11.4	0.11.4

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