{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:stigtsp:net\\:\\:cidr\\:\\:lite:*:*:*:*:*:perl:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.23"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9a0759afb56ec1a442d7cbb657ac07f6f3c29b17"
            },
            {
              "fixed": "25d65f85dbe4885959a10471725ec9d250a589c3"
            }
          ],
          "repo": "https://github.com/stigtsp/net-cidr-lite",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "CPANSec",
    "cwe_ids": [
      "CWE-1286"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40198.json"
  },
  "details": "Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass.\n\n_pack_ipv6() does not check that uncompressed IPv6 addresses (without ::) have exactly 8 hex groups. Inputs like \"abcd\", \"1:2:3\", or \"1:2:3:4:5:6:7\" are accepted and produce packed values of wrong length (3, 7, or 15 bytes instead of 17).\n\nThe packed values are used internally for mask and comparison operations. find() and bin_find() use Perl string comparison (lt/gt) on these values, and comparing strings of different lengths gives wrong results. This can cause find() to incorrectly report an address as inside or outside a range.\n\nExample:\n\n  my $cidr = Net::CIDR::Lite-\u003enew(\"::/8\");\n  $cidr-\u003efind(\"1:2:3\");  # invalid input, incorrectly returns true\n\nThis is the same class of input validation issue as CVE-2021-47154 (IPv4 leading zeros) previously fixed in this module.\n\nSee also CVE-2026-40199, a related issue in the same function affecting IPv4 mapped IPv6 addresses.",
  "id": "CVE-2026-40198",
  "modified": "2026-07-15T01:48:54.698144227Z",
  "published": "2026-04-10T21:42:06.835Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cpan.org/modules"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-40199"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40198.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.23/changes"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40198"
    },
    {
      "type": "FIX",
      "url": "https://github.com/stigtsp/Net-CIDR-Lite/commit/25d65f85dbe4885959a10471725ec9d250a589c3.patch"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/stigtsp/Net-CIDR-Lite"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass"
}