Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass

{
  "id": "dbde701165f533e08e2fe187980db51a8065efd666aee5e92eb7203dc2b81429",
  "url": "https://osv.dev/vulnerability/CVE-2026-45191",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass",
    "summary": "Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like \"/00\" and \"/01\" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.",
    "evidence": "osv:CVE-2026-45191",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-45191",
      "aliases": [
        "CVE-2026-45191"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/stigtsp/net-cidr-lite",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f5a20ecc59bdf23c4104a55e7f01a8c7729b7fc5"
                },
                {
                  "fixed": "24e2c439ec405e5256024b9acefd4f7008c5ed0c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.24"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "24e2c439ec405e5256024b9acefd4f7008c5ed0c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.23",
            "0.22",
            "0.21"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45191.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.029339375Z",
      "provider": "osv",
      "references": [
        "https://cpan.org/modules",
        "https://www.cve.org/CVERecord?id=CVE-2026-45190",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45191.json",
        "https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.24/changes",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45191",
        "https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c.patch",
        "https://github.com/stigtsp/Net-CIDR-Lite"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1289"
        ],
        "cna_assigner": "CPANSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45191.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45191",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500015,
  "published_at": "2026-05-10T20:15:53.897+00:00"
}