CVE-2026-88002: Openwebui Open Webui

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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

• Openwebui Open Webui: from 0.5.0, before 0.11.1 (fixed in 0.11.1)

Published 2026-09-09. Last modified 2026-09-14.