{
  "cve": [
    "CVE-2026-105483"
  ],
  "vulnerable": "24.x || 26.x",
  "patched": "^24.22.1 || ^26.12.1",
  "ref": "https://nodejs.org/en/blog/vulnerability/october-2026-security-releases",
  "description": "TLS certificate hostname bypass when the IP is written fullwidth digits",
  "overview": "A flaw in Node.js TLS hostname verification allows a certificate without a matching IP address SAN to authenticate a connection to an IPv4 address when the host is written with non-ASCII characters, such as fullwidth digits (`１２７.0.0.1`).\n\n`tls.checkServerIdentity()` did not recognize such hosts as IP addresses, even though they normalize and resolve to a regular IPv4 address, and matched them against the certificate DNS names and Common Name instead. A certificate containing `DNS:127.0.0.1` or `DNS:*.0.0.1` could therefore be accepted for an IP endpoint it was not issued for. This is a regression introduced after the fix for CVE-2026-48618.\n\nThis vulnerability affects Node.js **26.x** and **24.x**.",
  "affectedEnvironments": [
    "all"
  ],
  "severity": "high"
}