Understanding Squidbleed, CVE-2026-47729

This note examines CVE-2026-47729 (“Squidbleed”), an FTP-related information-disclosure bug in the Squid proxy, concluding that while it can expose secrets in specific configurations (attacker-controlled FTP servers and open proxies), typical deployments and HTTPS tunneling significantly limit exploitable instances; the bug has been patched and organizations are advised to inventory and patch Squid instances.