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            "title": "Stunnel: ssrf bypass in stunnel socks proxy via ipv4-mapped ipv6 loopback and unspecified addresses allows access to loopback-only services",
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                    "value": "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."
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                    "value": "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."
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                    "time": "2026-04-26T18:12:08.000Z",
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                    "time": "2026-08-04T10:29:57.207Z",
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