# CVE-2026-88002

## Summary

- **CVE ID:** CVE-2026-88002
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-835
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 10, 2026

## 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

- open-webui — open-webui (>= 0.5.0, < 0.11.1)

## References

- [CNA](https://github.com/open-webui/open-webui/security/advisories/GHSA-jqhh-cjmq-vmv6)
- [CNA](https://github.com/open-webui/open-webui/pull/28034)
- [CNA](https://github.com/open-webui/open-webui/commit/5c79ccc9e5c9efc2bc024d8f0b9757652ece929a)
- [CNA](https://github.com/open-webui/open-webui/releases/tag/v0.11.1)

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._