CVE-2022-21221: Fasthttp Project Fasthttp

High severity, CVSS 7.5. EPSS: 2.5% chance of exploitation in the next 30 days.

The package github.com/valyala/fasthttp before 1.34.0 are 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.

Affected products

• Fasthttp Project Fasthttp: before 1.34.0 (fixed in 1.34.0)

Published 2022-03-17. Last modified 2026-06-17.