CVE-2026-42012 — GnuTLS certificate validation bypass due to improper handling of URI and SRV SANs

A flaw was found in GnuTLS that could allow a remote attacker to present a specially crafted certificate containing URI or SRV Subject Alternative Names (SANs). The certificate validation process could incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.