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Vendor Workaround
To mitigate this issue, if SOCKS proxying functionality is not required, disable the "protocol = socks" configuration in "stunnel". If SOCKS proxying is necessary, restrict access to the SOCKS listener by binding it to a trusted management network or localhost, and enforce client authentication or network ACL controls. Run "stunnel" in a container or network namespace where no other services are bound to localhost, or add firewall rules to restrict outgoing connections from "stunnel" to localhost.
Tracking
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Tue, 04 Aug 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Tue, 04 Aug 2026 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Stunnel
Stunnel stunnel |
|
| Vendors & Products |
Stunnel
Stunnel stunnel |
Tue, 04 Aug 2026 14:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | stunnel: SSRF bypass in stunnel SOCKS proxy via IPv4-mapped IPv6 loopback and unspecified addresses allows access to loopback-only services | Stunnel: ssrf bypass in stunnel socks proxy via ipv4-mapped ipv6 loopback and unspecified addresses allows access to loopback-only services |
| First Time appeared |
Redhat
Redhat enterprise Linux |
|
| CPEs | cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9 |
|
| Vendors & Products |
Redhat
Redhat enterprise Linux |
|
| References |
|
Tue, 04 Aug 2026 12:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | stunnel: SSRF bypass in stunnel SOCKS proxy via IPv4-mapped IPv6 loopback and unspecified addresses allows access to loopback-only services | |
| Weaknesses | CWE-918 | |
| References |
| |
| Metrics |
threat_severity
|
cvssV3_1
|
Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-08-04T14:50:38.160Z
Reserved: 2026-08-04T07:03:23.572Z
Link: CVE-2026-70367
Updated: 2026-08-04T14:49:53.911Z
No data.
OpenCVE Enrichment
Updated: 2026-08-04T14:00:03Z