Request Smuggling Vulnerability in Pingora

This issue is already disclosed at https://www.cve.org/cverecord?id=CVE-2025-4366

A request smuggling vulnerability identified within Pingora’s proxying framework, pingora-proxy, allows malicious HTTP requests to be injected via manipulated request bodies on cache HITs, leading to unauthorized request execution and potential cache poisoning.

Fixed in

https://github.com/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff

Impact

The issue could lead to request smuggling in cases where Pingora’s proxying framework, pingora-proxy, is used for caching allowing an attacker to manipulate headers and URLs in subsequent requests made on the same HTTP/1.1 connection.

Additional Information

https://blog.cloudflare.com/resolving-a-request-smuggling-vulnerability-in-pingora/