CVE-2026-109297: Open WebUI 0.11.0 before 0.11.4 contains a denial of service vulnerability in the automation recurrence-rule v

Routine

MEDIUM 6.5

CVE-2026-109297 is a medium-severity flaw (CVSS 6.5) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-400, CWE-436
Published	2026-10-12
Last modified	2026-10-23

Publisher (CNA): VulnCheck

Timeline

2026-10-12 17:17 UTCPublished CVE record published
2026-10-23 22:16 UTCUpdated Record last modified

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References

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