Wsgiserver 02 Cpython 3104 Exploit May 2026

WsgiServer 0.2 is a minimal WSGI HTTP server implementation for CPython. A remote exploit targeting this combination (WsgiServer v0.2 running on CPython 3.10.4) leverages a flaw in how request input is parsed and how untrusted headers or payload bytes are handled, allowing remote attackers to cause arbitrary code execution or request smuggling under certain configurations.

If you manage a Python 3.10.4 web application, follow these hardening steps: wsgiserver 02 cpython 3104 exploit

| Action | Tool / Command | |--------|----------------| | Identify your WSGI server | pip list | grep -i "gunicorn\|uwsgi\|waitress\|cherrypy\|cheroot" | | Upgrade from legacy wsgiserver | Replace with cheroot (the modern fork) or gunicorn | | Enable HTTP parsing strictness | gunicorn --strict or waitress --strict-http | | Set header limits | --limit-request-line 8190 --limit-request-fields 100 | | Run as non-root user | useradd -r wsgi-user | | Use a reverse proxy (Nginx) with request validation | proxy_request_buffering on; proxy_set_header Host $host; | | Deploy a WAF (Web Application Firewall) | libmodsecurity for Nginx | | Regular vulnerability scanning | safety check or pip-audit | WsgiServer 0

Python 3.10.4 is an older release. While the vulnerability was formally identified and patched in later versions (mid-2024), the underlying code flaw existed in the 3.10 branch. If you are running 3.10.4, your environment is likely vulnerable unless you have backported the security patch manually. While the vulnerability was formally identified and patched