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High

Open WebUI Uncontrolled Resource Consumption vulnerability

  • Disclosed: 20.03.2025
  • Updated: 11.10.2026 13:18

In version 0.3.32 of open-webui/open-webui, the absence of authentication mechanisms allows any unauthenticated attacker to access the api/v1/utils/code/format endpoint. If a malicious actor sends a POST request with an excessively high volume of content, the server could become completely unresponsive. This could lead to severe performance issues, causing the server to become unresponsive or experience significant degradation, ultimately resulting in service interruptions for legitimate users.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package open-webui <= 0.3.32 no fix
Python (PyPI) open-webui <= 0.3.32 no fix

References

CVSS score 7.5/10
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-400, CWE-770
Platform
npm, Python (PyPI)
Package
open-webui
Disclosed
20.03.2025
Updated
11.10.2026 13:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-1728 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-chf7-q7m5-fq92 - CC BY 4.0

Vulnerability history: open-webui

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (10) in the archive
Total entries
10
First → latest
03.2025 05.2026
Without a fix
3
Exploited in attacks
0

Severity breakdown

  • High 9
  • Medium 1

Disclosures per year

Severity:
  1. Open WebUI has Stored XSS in Banner Component via Improper Sanitization Order
    High · 8.1 CVE-2026-45665 < 0.8.0 0.8.0
  2. Open WebUI: Missing `workspace.tools` Authorization Check on Tool Update Endpoint Allows Privilege Escalation to Code Execution
    High · 7.2 CVE-2026-45395 < 0.9.5 0.9.5
  3. open-webui Vulnerable to Stored XSS via Model Description
    High · 7.3 CVE-2026-44721 < 0.9.0 0.9.0
  4. Open WebUI Vulnerable to Stored DOM XSS via Note 'Download PDF'
    High · 8.7 CVE-2025-65959 < 0.6.37 0.6.37
  5. Open WebUI Affected by an External Model Server (Direct Connections) Code Injection via SSE Events
    High · 7.3 CVE-2025-64496 < 0.6.35 0.6.35
  6. Open WebUI vulnerable to Stored DOM XSS via prompts when 'Insert Prompt as Rich Text' is enabled resulting in ATO/RCE
    High · 8.7 CVE-2025-64495 < 0.6.35 0.6.35
  7. Open WebUI Unauthenticated Multipart Boundary Denial of Service (DoS) Vulnerability
    High · 7.5 ghsa-5ccf-884p-4jjq <= 0.3.21 no fix
  8. Open WebUI Uncontrolled Resource Consumption vulnerability
    High · 7.5 CVE-2024-12534 <= 0.3.32 no fix
  9. Open WebUI Uncontrolled Resource Consumption vulnerability this entry
    High · 7.5 CVE-2024-12537 <= 0.3.32 no fix

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