CVE-2025-22870

HTTP Proxy bypass using IPv6 Zone IDs in golang.org/x/net

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.

Patch Available

Fix available through Seal Security.  
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Fix without upgrading

Score

4.4

Severity

Medium

Ecosystem

Publish Date

March 12, 2025

Modified Date

April 16, 2026

Score Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

Affected Versions