The package github.com/valyala/fasthttp before 1.34.0 is vulnerable to Directory Traversal via the ServeFile function, due to improper sanitization. It is possible to be exploited by using a backslash %5c character in the path. Note: This security issue impacts Windows users only.
github.com/valyala/fasthttp
github.com/valyala/fasthttp/commit/15262ecf3c602364639d465daba1e7f3604d00e8
github.com/valyala/fasthttp/commit/6b5bc7bb304975147b4af68df54ac214ed2554c1
github.com/valyala/fasthttp/issues/1226
github.com/valyala/fasthttp/releases/tag/v1.34.0
nvd.nist.gov/vuln/detail/CVE-2022-21221
pkg.go.dev/vuln/GO-2022-0355
snyk.io/vuln/SNYK-GOLANG-GITHUBCOMVALYALAFASTHTTP-2407866