CVE-2026-64193

{
  "id": "CVE-2026-64193",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-07-20T19:17:30.047",
  "lastModified": "2026-10-24T20:10:00.137",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR.\n\nNet::DNS::RR::OPT::EXTENDED_ERROR::_decompose parses the EXTRA-TEXT field of an EDNS EXTENDED-ERROR option (RFC 8914) by tokenising the raw bytes and passing the result to Perl's eval. There is some escaping done for $ and @, but not for backticks. This can be exploited for command execution if $pkt->edns->option('EXTENDED-ERROR') is called in array context, for example with a payload of {0:`\"<command>\"`} in EXTRA-TEXT."
    },
    {
      "lang": "es",
      "value": "Las versiones de Net::DNS hasta la 1.55 para Perl permiten la inyección de ejecución remota a través de EDNS EXTENDED ERROR.\n\nNet::DNS::RR::OPT::EXTENDED_ERROR::_decompose analiza el campo EXTRA-TEXT de una opción EDNS EXTENDED-ERROR (RFC 8914) tokenizando los bytes sin procesar y pasando el resultado a la función eval de Perl. Se realiza cierto escape para $ y @, pero no para las comillas invertidas. Esto puede explotarse para la ejecución de comandos si se llama a $pkt  ->  edns  ->  option(’EXTENDED-ERROR’) en un contexto de array, por ejemplo, con una carga útil de {0:““[command]””} en EXTRA-TEXT."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "vendor": "NLNETLABS",
          "product": "Net::DNS",
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "Net-DNS",
          "programFiles": [
            "lib/Net/DNS/RR/OPT.pm"
          ],
          "programRoutines": [
            {
              "name": "Net::DNS::RR::OPT::EXTENDED_ERROR::_decompose"
            }
          ],
          "repo": "https://www.net-dns.org/svn/net-dns/",
          "versions": [
            {
              "version": "0",
              "lessThanOrEqual": "1.55",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-21T18:54:48.456598Z",
          "id": "CVE-2026-64193",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-95"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://rt.cpan.org/Ticket/Display.html?id=179945",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/07/20/12",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}