What is CVE-2026-109299?

CVE-2026-109299 is a medium-severity vulnerability in Open-Webui, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-10-12.

How severe is CVE-2026-109299?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Open-Webui

CVE-2026-109299

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.

Vulnerability class: DoS (Denial of Service)

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Open-Webui

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/open-webui/open-webui/security/advisories/GHSA-5w58-mwmh-vf2m (vendor-advisory)
github.com/open-webui/open-webui/commit/5fb869db221d9599a576e8e2eea9c3314947d25e (patch)
www.vulncheck.com/advisories/open-webui-0.9.0-before-0.11.4-denial-of-service-v… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109299?: CVE-2026-109299 is a medium-severity vulnerability in Open-Webui, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-10-12.
How severe is CVE-2026-109299?: Medium severity. CVSS v3 base score is 6.5 out of 10.