{
  "cveId": "CVE-2026-87082",
  "url": "https://patchblox.com/security/cve/CVE-2026-87082",
  "summary": "CVE-2026-87082 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-87082, released September 22, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "libnet-idn-encode-perl: Net::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8...",
  "description": "Net::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycode.  Neither backend checks that its input is well-formed UTF-8, so a string with the UTF-8 flag set over malformed bytes, as the :utf8 PerlIO layer produces from any malformed input, reaches the encoder unchecked. On perl 5.32 and later the XS backend reports a malformed sequence with a length of \u0060(STRLEN)-1\u0060, so the scan steps back one byte instead of forward and never ends. On earlier perls the XS returns a valid label for a different name. The pure-Perl backend runs a regex over the flagged string. Depending on the bytes, it aborts with SIGBUS on perl 5.28 and later, dies with a panic, or returns a wrong label.  The documented conversion functions match the label against Unicode properties first and that match dies on such a string, so only a direct call to encode_punycode reaches the defect. The decoder is not affected.  A direct caller encoding attacker-supplied bytes hangs, crashes or gets a label for a name the input never held.",
  "published": "2026-09-22T08:16:40Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00422,
  "epssPercentile": 0.36783,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libnet-idn-encode-perl",
      "release": "Debian 14",
      "fixedVersion": "2.600-1",
      "fix": "DEBIAN-CVE-2026-87082",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-87082",
      "released": "2026-09-22T08:16:40Z"
    },
    {
      "platform": "linux",
      "product": "perl-Net-IDN-Encode",
      "release": "amzn 2023",
      "fixedVersion": "2.590-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3190",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3190",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "perl-Net-IDN-Encode-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.590-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3190",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3190",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "perl-Net-IDN-Encode-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "2.590-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3190",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3190",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T07:50:38Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}