urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

Impact When following cross-origin redirects for requests made using urllib3’s high-level APIs, such as urllib3.request, PoolManager.request, and ProxyManager.request, sensitive headers — Authorization, Cookie, and Proxy-Authorization defined in Retry.DEFAULTREMOVEHEADERSONREDIRECT — are stripped...

Fabio allows HTTP clients to manipulate custom headers it adds

Summary Fabio allows clients to remove X-Forwarded headers except X-Forwarded-For due to a vulnerability in how it processes hop-by-hop headers. Fabio adds HTTP headers like X-Forwarded-Host and X-Forwarded-Port when routing requests to backend applications. Since the receiving application should...