CVE-2022-30636: Golang Crypto

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

httpTokenCacheKey uses path.Base to extract the expected HTTP-01 token value to lookup in the DirCache implementation. On Windows, path.Base acts differently to filepath.Base, since Windows uses a different path separator (\ vs. /), allowing a user to provide a relative path, i.e. .well-known/acme-challenge/..\..\asd becomes ..\..\asd. The extracted path is then suffixed with +http-01, joined with the cache directory, and opened. Since the controlled path is suffixed with +http-01 before opening, the impact of this is significantly limited, since it only allows reading arbitrary files on the system if and only if they have this suffix.

Affected products

• Golang Crypto: before 0.0.0-20220525230936-793ad666bf5e (fixed in 0.0.0-20220525230936-793ad666bf5e)
• Golang.org/x/crypto Golang.org/x/crypto/acme/autocert: before 0.0.0-20220525230936-793ad666bf5e (fixed in 0.0.0-20220525230936-793ad666bf5e)

Published 2024-07-02. Last modified 2026-06-17.