CVE-2026-109299CWE-400CWE-834denial-of-service

CVE-2026-109299

Medium · published October 12, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
30.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00376 · 30.3th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-834 · Excessive Iteration
Published
2026-10-12T21:17Z
References (3)
https://github.com/open-webui/open-webui/commit/5fb869db221d9599a576e8e2eea9c3314947d25e · [email protected]https://github.com/open-webui/open-webui/security/advisories/GHSA-5w58-mwmh-vf2m · [email protected]https://www.vulncheck.com/advisories/open-webui-0.9.0-before-0.11.4-denial-of-service-via-recurrence-rule-validation · [email protected]
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:04Z
    Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation
    cvelistv5
  • 12 OCT 16:04Z
    Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation
    cvelistv5