CVE-2026-91143: SNAIL007 Goproxy

High severity, CVSS 7.2. EPSS: 0.5% chance of exploitation in the next 30 days.

goproxy through 15.3 fails to apply HTTP proxy basic authentication to CONNECT tunnel requests, allowing unauthenticated clients to bypass credential requirements. Attackers can issue CONNECT requests to establish tunnels through the authenticated proxy without providing credentials, enabling arbitrary TCP traffic relay and access to restricted destinations.

Affected products

• SNAIL007 Goproxy: up to and including 15.3

Published 2026-09-14. Last modified 2026-09-23.