CVE-2026-109297 Open WebUI 0.11.0 before 0.11.4 Denial of Service via Automation Recurrence Rules
Users can cause denial of service by submitting malformed automation rules that block the event loop, requiring an upgrade to Open WebUI.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109297?
CVE-2026-109297 is a high-severity denial of service vulnerability in open-webui, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-109297?
How do I fix CVE-2026-109297?
No fix has been published for CVE-2026-109297 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-109297 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109297 exists.
Sources
Also known as GHSA-m3p8-5778-73h9, GHSA-whgc-vpjx-m3qh.