AIKIDO-2025-10638
github.com/valyala/fasthttp is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
20
Low Risk
This Affects:
github.com/valyala/fasthttpTL;DR
Affected versions of this package are vulnerable to Cache Poisoning via Incorrect HTTP Request Parsing due to a violation of RFC 9112 where the HTTP request line parser would incorrectly include extra whitespace characters as part of the request URI; when deployed behind a caching proxy, an attacker could exploit this by sending a request containing whitespace, which the proxy would interpret as a unique resource and cache the response, potentially allowing the poisoning of the cache for a legitimate URL without whitespace.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
github.com/valyala/fasthttp is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in versions 1.0.0 - 1.65.0.
How to fix this
Upgrade the github.com/valyala/fasthttp library to the patch version.
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