CVE-2026-70367

The full cvelistV5 record. Download as CVE-2026-70367.json.

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        "title": "CISA ADP Vulnrichment"
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          "product": "Red Hat Enterprise Linux 6",
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          "value": "A Server-Side Request Forgery (SSRF) bypass vulnerability exists in \u201cstunnel\u201d 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., \u201c::ffff:127.0.0.1\u201d) 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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            "integrityImpact": "LOW",
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          "time": "2026-04-26T18:12:08.000Z",
          "value": "Reported to Red Hat."
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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": "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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    "dateReserved": "2026-08-04T07:03:23.572Z",
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