This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-70367 →
DEBIAN-CVE-2026-70367
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 c...
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Debian:14
stunnel
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3:5.80-1"}]}]
Debian:12
stunnel4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:13
stunnel4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- advisory security-tracker.debian.org