{"id":"DEBIAN-CVE-2026-70367","details":"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.","modified":"2026-10-01T01:03:40.266194332Z","published":"2026-08-04T14:16:32.557Z","upstream":["CVE-2026-70367"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-70367"}],"affected":[{"package":{"name":"stunnel","ecosystem":"Debian:14","purl":"pkg:deb/debian/stunnel?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3:5.80-1"}]}],"versions":["2:3.26-10","2:3.26-11","2:3.26-2","2:3.26-2.1","2:3.26-3","2:3.26-4","2:3.26-5","2:3.26-6","2:3.26-7","2:3.26-8","2:3.26-9","2:3.26-dfsg-1","2:3.26-dfsg-2","3.10-0potato1","3.22-1","3:5.78-3","3:5.78-4","3:5.78-5","3:5.79-1","3:5.79-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-70367.json"}}],"schema_version":"1.9.0"}