{
  "cveId": "CVE-2026-87079",
  "url": "https://patchblox.com/security/cve/CVE-2026-87079",
  "summary": "CVE-2026-87079 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-87079, 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 allow CPU exhaustion via quadratic insertion cost when decoding a l...",
  "description": "Net::IDN::Punycode versions before 2.590 for Perl allow CPU exhaustion via quadratic insertion cost when decoding a long label in decode_punycode.  The XS backend inserts each decoded code point into a UTF-8 buffer and finds the insertion point by scanning that buffer from the start, one character at a time. The scan runs once per code point over the output built so far, so the cost is quadratic in the label length. The pure-Perl backend downgrades its input to bytes so that substr can index it directly, but takes its working copy before the downgrade, so when the input carries the UTF-8 flag every substr on the copy scans from the start, with the same quadratic cost.  Nothing bounds the label length in the to-Unicode direction. The 63-byte DNS limit is checked only when converting to ASCII, so domain_to_unicode and uts46_to_unicode pass an attacker-supplied label of any length to the decoder.",
  "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": 0.00379,
  "epssPercentile": 0.32193,
  "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-2026-87079",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-87079",
      "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": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}