Wsgiserver 02 Cpython 3104 Exploit May 2026

"wsgiserver 0.2 CPython 3.10.4 exploit"

The search results for often lead to Capture The Flag (CTF) writeups and security articles rather than a single direct vulnerability in the server itself. This specific version string is frequently seen in the HTTP headers of Python-based web applications, particularly those used in cybersecurity labs like OffSec’s Proving Grounds . Common Context and Exploits

Intended Header:

When sent to a vulnerable endpoint, the server processes the input: Set-Cookie: user=Admin Injected Header: Set-Cookie: user=Admin Set-Cookie: session=pwned Use code with caution. Copied to clipboard wsgiserver 02 cpython 3104 exploit

GET / HTTP/1.1 Host: vulnerable-server.com X-Malicious-Header: value\r\nSet-Cookie: session=attacker_owned\r\nContent-Length: 0\r\n\r\n "wsgiserver 0

• Send a chunked or malformed Content-Length header combined with extra CRLF sequences to create a second, attacker-controlled request payload appended to the first request.