---
id: CVE-2026-109295
title: >-
  Open WebUI from 0.11.0 before 0.11.4 contains a regular expression denial of
  service vulnerability that allows authenticated users to stall server workers
  via file search patterns
summary: >-
  Open WebUI from 0.11.0 before 0.11.4 contains a regular expression denial of
  service vulnerability that allows authenticated users to stall server workers
  via file search patterns. Attackers can instruct the model to call
  grep_knowledge_…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-1333
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T17:17:22.950'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109295'
references:
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-gfjp-5hc9-852r
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-redos-via-grep-knowledge-files-event-loop
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T18:00:08.192Z'
---

## Overview

Open WebUI from 0.11.0 before 0.11.4 contains a regular expression denial of service vulnerability that allows authenticated users to stall server workers via file search patterns. Attackers can instruct the model to call grep_knowledge_files or grep_chat_files with a catastrophically backtracking regex, blocking the event loop for two seconds per repeated call.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.