---
id: CVE-2026-70493
title: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform
summary: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform. From 0.9.6 until 0.11.0, the built-in knowledge search path in
  backend/open_webui/tools/knowledge_fs.py and
  backend/open_webui/tools/builtin.py let a c…
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
vendor: openwebui
product: open_webui
affected:
  - 'open_webui >= 0.9.6, < 0.11.0'
patched:
  - open_webui 0.11.0
published: '2026-08-04'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T14:45:36.047'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70493'
references:
  - url: >-
      https://github.com/open-webui/open-webui/commit/3ab2026262ef6f09810e4d235c5f9a9cb903e595
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/pull/27471'
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/releases/tag/v0.11.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-2f54-p244-32q6
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-2f54-p244-32q6
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-2f54-p244-32q6'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00592
epssPercentile: 0.46037
aliases:
  - GHSA-2f54-p244-32q6
ecosystem: pip
ingestedAt: '2026-08-04T21:42:19.609Z'
---

## Overview

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, the built-in knowledge search path in backend/open_webui/tools/knowledge_fs.py and backend/open_webui/tools/builtin.py let a chat participant choose a pattern used to grep knowledge files. Patterns containing regex metacharacters were compiled with Python's backtracking re engine and run against every line of every reachable file with no time limit, so a crafted pattern such as (x|x)*y and one matching uploaded file line can pin one CPU core and block the event loop. This causes availability impact for every other user of the affected worker. This issue is fixed in 0.11.0.

## Affected

- `open_webui >= 0.9.6, < 0.11.0`

## Remediation

Upgrade past the affected range:

- `open_webui 0.11.0`

## Package advisory (CVE-2026-70493)

Affected packages:

- `open-webui >= 0.9.6, < 0.11.0`

Patched in:

- `open-webui 0.11.0`

Source: https://github.com/advisories/GHSA-2f54-p244-32q6