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OpenAdvisories
Medium · 6.5 CVE-2026-88002 EUVD-2026-75188GHSA-jqhh-cjmq-vmv6PYSEC-2026-3879

Open WebUI: Any authenticated user can hang the server via a cyclic chat message history

Published Sep 9, 2026 · Updated Sep 14, 2026 · Assigned by GitHub_M

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.1, the message-chain reconstruction helper in backend/open_webui/utils/misc.py advanced through a chat history by map key but tracked visited entries using each message body's optional id field. An authenticated user could store id-less messages in a parent cycle and trigger a non-terminating walk that blocked the async event loop, grew memory until termination, and remained persistent across process restarts. This issue is fixed in version 0.11.1.

Affected products

VendorProductAffectedFixed
open-webui open-webui >= 0.5.0, < 0.11.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI open-webui >= 0.5.0, < 0.11.1 0.11.1 GHSA-jqhh-cjmq-vmv6

References