{
  "cveId": "CVE-2026-73253",
  "url": "https://patchblox.com/security/cve/CVE-2026-73253",
  "summary": "CVE-2026-73253 is fixed in mongoose on 1 platform by DEBIAN-CVE-2026-73253 (version 7.22\u002Bds-1), released August 21, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "mongoose: Mongoose is an embedded web server and network library",
  "description": "Mongoose is an embedded web server and network library. Prior to version 7.22, an on-path network attacker with a wildcard certificate for a parent domain can impersonate deeper subdomains to a client using the built-in TLS stack. The mg_tls_verify_cert_san() and mg_tls_verify_cert_cn() functions in src/tls_builtin.c call mg_match(), whose wildcard can cross DNS label boundaries, so a pattern such as *.example.com can match foo.bar.example.com. The resulting hostname verification bypass permits interception and modification of TLS traffic. This issue is fixed in version 7.22.",
  "published": "2026-08-20T18:16:45Z",
  "severity": "critical",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00344,
  "epssPercentile": 0.28097,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "mongoose",
      "release": "Debian 14",
      "fixedVersion": "7.22\u002Bds-1",
      "fix": "DEBIAN-CVE-2026-73253",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-73253",
      "released": "2026-08-21T23:37:15Z"
    }
  ],
  "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"
  }
}