CVE-2025-22870

Description

Matching of hosts against proxy patterns can improperly treat an IPv6 zone ID as a hostname component. For example, when the NO_PROXY environment variable is set to "*.example.com", a request to "[::1%25.example.com]:80` will incorrectly match and not be proxied.

CVSS breakdown

Affected products

• golang.org/x/net / golang.org/x/net/http/httpproxy0 – 0.36.0
• golang.org/x/net / golang.org/x/net/proxy0 – 0.36.0
• Go standard library / net/http0 – 1.23.7
• Go standard library / net/http1.24.0-0 – 1.24.1

References

• MISChttps://go.dev/cl/654697
• MISChttps://go.dev/issue/71984
• MISChttps://groups.google.com/g/golang-announce/c/4t3lzH3I0eI/m/b42ImqrBAQAJ
• MISChttps://pkg.go.dev/vuln/GO-2025-3503