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CVE-2022-29361

CriticalPublished

Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform HTTP Request Smuggling using a crafted HTTP request with...

Published: May 24, 2022
Updated: Aug 3, 2024
Assigning CNA: mitre
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

8.1%

Low · next 30 days

Percentile: 94.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform HTTP Request Smuggling using a crafted HTTP request with multiple requests included inside the body. NOTE: the vendor's position is that this behavior can only occur in unsupported configurations involving development mode and an HTTP server from outside the Werkzeug project

Sources

Werkzeug-CVE-2022-29361-PoCPoC
Proof-of-concept exploit for CVE-2022-29361, demonstrating remote code execution via Werkzeug debugger console in Python web applications.
CVE-2022-29361_Werkzeug_Client-Side-Desync-to-XSSPoC
Proof-of-concept exploit for CVE-2022-29361, demonstrating client-side desync to XSS in Werkzeug. Tested on Chromium.

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