Medium severity · published Aug 4, 2026
CVE-2026-70489
Open WebUI: Instance-wide stall via automation recurrence rules that force multi-second parsing
6.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
>= 0.9.0, < 0.11.0 · source: vendor
OW
Open Webui · Openwebui
0.9.0 before 0.11.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70489
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70489
Patch
https://github.com/open-webui/open-webui/commit/c4ae8c86786fed521960466f6d8eef8af22c2946
Release Notes
https://github.com/open-webui/open-webui/releases/tag/v0.11.0
Exploit
https://github.com/open-webui/open-webui/security/advisories/GHSA-73cq-mcgh-379c
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