# CVE-2026-88002 — open-webui

> As of 2026-09-09, CVE-2026-88002 is a MEDIUM-severity vulnerability in open-webui, CVSS v3.1 6.5, EPSS 0.3% (23.0th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-88002 as of 2026-09-09; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-09

## What is CVE-2026-88002?

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.

The record classifies CVE-2026-88002 under weakness class [CWE-835](https://intel.threadlinqs.com/cwe/CWE-835). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 26 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.5 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 23.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-09

## Is CVE-2026-88002 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [open-webui](https://intel.threadlinqs.com/vendors/open-webui): open-webui

Affected software packages:

- `pip:open-webui` — patched in 0.11.1

## How to fix CVE-2026-88002

Fixed versions are recorded for 1 package: pip:open-webui 0.11.1. No vendor patch reference has been recorded for CVE-2026-88002 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-88002

No threat campaign in the Threadlinqs corpus currently references CVE-2026-88002, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-11. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/open-webui/open-webui/security/advisories/GHSA-jqhh-cjmq-vmv6)

**Other references**

- [github.com](https://github.com/open-webui/open-webui/pull/28034)
- [github.com (5c79ccc9e5c9efc2bc024d8f0b9757652ece929a)](https://github.com/open-webui/open-webui/commit/5c79ccc9e5c9efc2bc024d8f0b9757652ece929a)
- [github.com (v0.11)](https://github.com/open-webui/open-webui/releases/tag/v0.11.1)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-88002
Full detection coverage and IOCs for threats exploiting CVE-2026-88002 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp