CVE-2026-70367
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
Product
Mobi-com Polska Sp. Z O.o. Stunnel
PublishedAug 4, 2026
First seenAug 4, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Update
- Mobi-Com Polska Sp. z o.o. stunnel5.80 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Mobi-Com Polska Sp. z o.o. stunnel | 5.25 ≤ v < 5.80 | 5.80 |
| Red Hat Red Hat Enterprise Linux 10 | No range specified | — |
| Red Hat Red Hat Enterprise Linux 8 | No range specified | — |
| Red Hat Red Hat Enterprise Linux 9 | No range specified | — |
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