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Vulnerabilities CVE-2026-70489

CVE-2026-70489

Medium
Open
TLP:CLEAR

Open WebUI: Instance-wide stall via automation recurrence rules that force multi-second parsing

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Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, automation recurrence parsing in backend/open_webui/utils/automations.py anchored minutely and hourly rules at a fixed date of 2000-01-01 and then walked forward one interval at a time to find the next run. A single FREQ=MINUTELY rule enumerates roughly a quarter-century of occurrences synchronously on the event loop that also serves scheduler, HTTP, and WebSocket traffic, and the scheduler recomputes the next run for every claimed row on each poll. This causes availability impact for every other user of the instance. This issue is fixed in 0.11.0.

Details

CVSS Score
6.5
EPSS Score
0.30%

22.1th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Aug 4, 2026
Last Modified
Aug 5, 2026
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