CVE-2026-19954 (GCVE-0-2026-19954)
Vulnerability from cvelistv5
Published
2026-10-05 06:54
Modified
2026-10-06 17:52
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
{
"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"
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"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"
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"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"
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"programRoutines": [
{
"name": "to_punycode"
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],
"repo": "https://github.com/regru/Net-Whois-Raw",
"versions": [
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"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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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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