Resource exhaustion in Open-Webui
CVE-2026-109297
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.
Vulnerability class: DoS (Denial of Service)
Published .
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
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/security/advisories/GHSA-whgc-vpjx-m3qh (vendor-advisory)
- www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-denial-of-service-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109297?
- CVE-2026-109297 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-2026-109297?
- Medium severity. CVSS v3 base score is 6.5 out of 10.