CVE-2026-70367

Published: Aug 4, 2026Modified: Aug 6, 2026

5.4

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploitability: 2.8 / Impact: 2.5

Source: secalert@redhat.com (Secondary)

Description

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.

Related CWEs

CWE-918

Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

References (3)

https://access.redhat.com/security/cve/CVE-2026-70367

Source: secalert@redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2462083

Source: secalert@redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2462083

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.