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Start learningUpgrade fastapi-proxy-lib to version 0.1.0 or higher.
fastapi-proxy-lib is a HTTP/WebSocket proxy for starlette/FastAPI.
Affected versions of this package are vulnerable to Information Exposure due to the shared usage of httpx.AsyncClient in processing requests from different user clients. An attacker can exploit this to leak cookies among all user clients sharing the same httpx.AsyncClient by sending a set-cookie response header. This is only exploitable if the ForwardHttpProxy is used, or if ReverseHttpProxy or ReverseWebSocketProxy are used for servers that may potentially send a set-cookie response.
This vulnerability can be mitigated by not using ForwardHttpProxy at all, and not using ReverseHttpProxy or ReverseWebSocketProxy for any servers that may potentially send a set-cookie response.