CVE-2026-70367CWE-918ssrf

CVE-2026-70367

Medium · published August 4, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
4.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00156 · 4.3th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-08-04T18:16Z
References (3)
https://access.redhat.com/security/cve/CVE-2026-70367 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2462083 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2462083 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 04 AUG 13:52Z
    Stunnel: ssrf bypass in stunnel socks proxy via ipv4-mapped ipv6 loopback and unspecified addresses allows access to loopback-only services
    cvelistv5