Vulnerability · Published Sep 9, 2026 · Assigned by GitHub_M
CVE-2026-88002Open WebUI: Any authenticated user can hang the server via a cyclic chat message history
Medium 6.5
In plain English
A medium-severity infinite loop in open-webui from open-webui. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | open-webui | 0.11.1 | GHSA-jqhh-cjmq-vmv6 |
| PyPI | open-webui | 0.11.1 | PYSEC-2026-3879 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-webui | open-webui | >= 0.5.0, < 0.11.1 |
Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-jqhh-cjmq-vmv6 x_refsource_CONFIRM
- https://github.com/open-webui/open-webui/pull/28034 x_refsource_MISC
- https://github.com/open-webui/open-webui/commit/5c79ccc9e5c9efc2bc024d8f0b9757652ece929a x_refsource_MISC
- https://github.com/open-webui/open-webui/releases/tag/v0.11.1 x_refsource_MISC