{
  "cveId": "CVE-2026-70367",
  "url": "https://patchblox.com/security/cve/CVE-2026-70367",
  "summary": "CVE-2026-70367 is fixed in stunnel on 1 platform, first by DEBIAN-CVE-2026-70367, released August 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Stunnel: ssrf bypass in stunnel socks proxy via ipv4-mapped ipv6 loopback and unspecified addresses allows access to loopback-only services",
  "description": "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 (\u00220.0.0.0\u0022, \u0022::\u0022), enabling access to loopback-only services on the \u0022stunnel\u0022 host that should not be network-reachable.",
  "published": "2026-08-04T14:16:32Z",
  "severity": "Moderate",
  "cvss": 5.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
  "cwe": "Server-Side Request Forgery (SSRF)",
  "epss": 0.00224,
  "epssPercentile": 0.13104,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70367",
  "fixes": [
    {
      "platform": "linux",
      "product": "stunnel",
      "release": "Debian 14",
      "fixedVersion": "3:5.80-1",
      "fix": "DEBIAN-CVE-2026-70367",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-70367",
      "released": "2026-08-08T15:30:50Z"
    },
    {
      "platform": "linux",
      "product": "stunnel",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "5.74-160000.3.1",
      "fix": "OPENSUSE-SU-2026:22088-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22088-1",
      "released": "2026-11-07T00:48:28Z"
    },
    {
      "platform": "linux",
      "product": "stunnel",
      "release": "sles 15.7",
      "fixedVersion": "5.70-150600.3.6.1",
      "fix": "SUSE-SU-2026:4617-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4617-1",
      "released": "2026-11-07T00:44:01Z"
    },
    {
      "platform": "linux",
      "product": "stunnel",
      "release": "sles 16.0",
      "fixedVersion": "5.74-160000.3.1",
      "fix": "SUSE-SU-2026:24232-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24232-1",
      "released": "2026-11-07T00:45:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}