CVE-2026-70367: Stunnel: ssrf bypass in stunnel socks proxy via ipv4-mapped ipv6 loopback and unspecified addresses allows access to loopback-only services

Overview

Severity

Medium (CVSS 5.4)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Aug

Released

2026-08-07

EPSS Score

0.15% (percentile: 5.2%)

Affected Products (1)

Open Source Software

• azl3 stunnel 5.74-1 on Azure Linux 3.0

Revision History

• 2026-08-07: Information published.