---
id: CVE-2026-109297
title: >-
  Open WebUI 0.11.0 before 0.11.4 contains a denial of service vulnerability in
  the automation recurrence-rule validator, whose sub-daily frequency guard
  parses rule text more strictly than the calendar library that executes it
summary: >-
  Open WebUI 0.11.0 before 0.11.4 contains a denial of service vulnerability in
  the automation recurrence-rule validator, whose sub-daily frequency guard
  parses rule text more strictly than the calendar library that executes it.
  Users perm…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T17:17:23.240'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109297'
references:
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-whgc-vpjx-m3qh
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-denial-of-service-via-automation-recurrence-rules
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T18:00:08.193Z'
---

## Overview

Open WebUI 0.11.0 before 0.11.4 contains a denial of service vulnerability in the automation recurrence-rule validator, whose sub-daily frequency guard parses rule text more strictly than the calendar library that executes it. Users permitted to create automations can submit whitespace-folded rules (or, in 0.11.0, lowercase frequencies or omitted RRULE prefixes) that expand per-second synchronously, blocking the shared event loop for minutes per request and on every scheduler poll.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.