CVE-2026-19954 (GCVE-0-2026-19954)
Vulnerability from cvelistv5
Published
2026-10-05 06:54
Modified
2026-10-06 17:52
CWE
  • CWE-176 - Improper Handling of Unicode Encoding
Summary
Net::Whois::Raw versions before 2.99044 for Perl ship a pwhois command-line tool that queries WHOIS for the wrong domain for unicode domain names. pwhois encodes each non-ASCII label directly using Net::IDN::Punycode and prepends xn--. Apart from lowercasing ASCII and Cyrillic letters, it skips the IDNA mapping and normalization steps, so a label with other uppercase letters, or not in NFC, encodes to a different A-label than its IDNA form. For example, a label of U+00C9 followed by "cole" encodes to "xn--cole-pka" rather than "xn--cole-9oa". The Net::Whois::Raw library modules are not affected.
Impacted products
Vendor Product Version
Version: 0   < 2.99044
Create a notification for this product.
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-10-05T18:10:20.168Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/10/05/9"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 5.4,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-19954",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-06T17:52:04.047979Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-06T17:52:09.371Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Net::Whois::Raw"
          ],
          "packageName": "Net-Whois-Raw",
          "packageURL": "pkg:cpan/Net-Whois-Raw",
          "programFiles": [
            "bin/pwhois"
          ],
          "programRoutines": [
            {
              "name": "to_punycode"
            }
          ],
          "repo": "https://github.com/regru/Net-Whois-Raw",
          "versions": [
            {
              "lessThan": "2.99044",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Net::Whois::Raw versions before 2.99044 for Perl ship a pwhois command-line tool that queries WHOIS for the wrong domain for unicode domain names.\n\npwhois encodes each non-ASCII label directly using Net::IDN::Punycode and prepends xn--. Apart from lowercasing ASCII and Cyrillic letters, it skips the IDNA mapping and normalization steps, so a label with other uppercase letters, or not in NFC, encodes to a different A-label than its IDNA form. For example, a label of U+00C9 followed by \"cole\" encodes to \"xn--cole-pka\" rather than \"xn--cole-9oa\".\n\nThe Net::Whois::Raw library modules are not affected."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-176",
              "description": "CWE-176 Improper Handling of Unicode Encoding",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-05T06:54:09.352Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/NALOBIN/Net-Whois-Raw-2.99044/changes"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://security.metacpan.org/patches/N/Net-Whois-Raw/2.99043/CVE-2026-19954-r1.patch"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/regru/Net-Whois-Raw/issues/34"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/regru/Net-Whois-Raw/pull/35"
        },
        {
          "url": "https://metacpan.org/release/PJCJ/Net-IDN-Encode-2.590-TRIAL/view/lib/Net/IDN/Punycode.pm#WARNING"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://www.rfc-editor.org/rfc/rfc5891#section-5.2"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Net::Whois::Raw versions before 2.99044 for Perl ship a pwhois command-line tool that queries WHOIS for the wrong domain for unicode domain names",
      "workarounds": [
        {
          "lang": "en",
          "value": "Apply the patch.\n\nFor deployments that cannot apply the patch, convert the domain name to its A-label form, for example with Net::IDN::Encode::domain_to_ascii, before passing it to pwhois. pwhois passes all-ASCII names through unchanged."
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-19954",
    "datePublished": "2026-10-05T06:54:09.352Z",
    "dateReserved": "2026-08-15T21:45:07.158Z",
    "dateUpdated": "2026-10-06T17:52:09.371Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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