Authorization Bypass Through User-Controlled Key

Overview github.com/valyala/fasthttp is a fast HTTP server and client API. Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via the ServeFile and ServeFS functions. An attacker can bypass access controls by submitting double-encoded path variant...

PT-2026-80339

In github.com/valyala/fasthttp before 1.70.0, ServeFile and ServeFS reinterpret filesystem paths as URIs, decoding percent-encoded sequences and treating characters like '?' and '' as URI delimiters. In applications where authorization guards inspect ctx.Path before passing paths to file-serving...