Open WebUI: Any authenticated user can hang the server via a cyclic chat message history (CVE-2026-88002) | HOL Guard CVE

Medium · CVSS 6.5CVE-2026-88002GHSA-JQHH-CJMQ-VMV6

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

Answer in brief

CVE-2026-88002 records a Medium severity (CVSS 6.5) vulnerability in Open WebUI: Any authenticated user can hang the server via a cyclic chat message history. The current sources do not mark it as known exploited. The current feed maps open-webui/open-webui (generic), open-webui (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 9, 2026Updated Sep 9, 2026Source checked Sep 10, 2026First seen by HOL Sep 9, 2026Material review Sep 9, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps open-webui/open-webui (generic), open-webui (pip). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
open-webui/open-webuigeneric	>= 0.5.0, < 0.11.1	Not reported
open-webuipip	>=0.5.0,<0.11.1	0.11.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for open-webui/open-webui, open-webui.
Review the reported fix. Update open-webui to 0.11.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 9, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.