Medium 6.5Published Oct 12, 2026

CVE-2026-109299Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation

Updated under an hour ago (2026-10-19 06:25 UTC)

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It affects open-webui. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for open-webui

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Oct 13, 2026
First seen by InfoSec Signals: Oct 12, 2026

Affected products

Affected products

open-webui open-webui open_webui:open_webui (from the name)	from 0.9.0 before 0.11.4; 0.11.4 not affected	CNA record

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-5w58-mwmh-vf2mvendor-advisory
https://github.com/open-webui/open-webui/commit/5fb869db221d9599a576e8e2eea9c3314947d25epatch
https://www.vulncheck.com/advisories/open-webui-0.9.0-before-0.11.4-denial-of-service-via-recurrence-rule-validationthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.