CVE-2026-70367

Descripción

A Server-Side Request Forgery (SSRF) bypass vulnerability exists in -stunnel- 5.79 and lower when configured in SOCKS proxy mode. This flaw allows a client to bypass intended localhost restrictions by using IPv4-mapped IPv6 addresses (e.g., -::ffff:127.0.0.1-) or unspecified addresses (-0.0.0.0-, -::-), enabling access to loopback-only services on the -stunnel- host that should not be network-reachable.