Medium
libnet-whois-raw-perl — security advisory
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.
- Products
- libnet-whois-raw-perl
- Affected versions
- 2.43-1, 2.43-1.1, 2.99042-1, 2.99043-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-19954
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:42 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-19954
libnet-whois-raw-perl
Fixed versions: Not specified
libnet-whois-raw-perl
Fixed versions: Not specified
libnet-whois-raw-perl
Fixed versions: Not specified
libnet-whois-raw-perl
Fixed versions: Not specified
libnet-whois-raw-perl
Fixed versions: Not specified
libnet-whois-raw-perl
Fixed versions: Not specified
libnet-whois-raw-perl
Fixed versions: Not specified
Complete source record
{
"id": "dc4dfbaeb4e903744dcdb179c5dd39eb7b77e5bb361ec4458ab50cdcd7d7c20e",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-19954",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-19954",
"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.",
"evidence": "osv:UBUNTU-CVE-2026-19954",
"products": [
{
"name": {
"value": "libnet-whois-raw-perl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.43-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libnet-whois-raw-perl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.43-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libnet-whois-raw-perl",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.43-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "libnet-whois-raw-perl",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.43-1.1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "libnet-whois-raw-perl",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.43-1.1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "libnet-whois-raw-perl",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.99042-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.99043-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "libnet-whois-raw-perl",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.43-1.1",
"evidence": "/affected/6/versions"
},
{
"value": "2.99042-1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-19954",
"aliases": [
"UBUNTU-CVE-2026-19954"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-whois-raw-perl",
"purl": "pkg:deb/ubuntu/libnet-whois-raw-perl?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"2.43-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19954.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-whois-raw-perl",
"binary_version": "2.43-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-whois-raw-perl",
"purl": "pkg:deb/ubuntu/libnet-whois-raw-perl?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"2.43-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19954.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-whois-raw-perl",
"binary_version": "2.43-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-whois-raw-perl",
"purl": "pkg:deb/ubuntu/libnet-whois-raw-perl?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"2.43-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19954.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-whois-raw-perl",
"binary_version": "2.43-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-whois-raw-perl",
"purl": "pkg:deb/ubuntu/libnet-whois-raw-perl?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"2.43-1.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19954.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-whois-raw-perl",
"binary_version": "2.43-1.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-whois-raw-perl",
"purl": "pkg:deb/ubuntu/libnet-whois-raw-perl?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"2.43-1.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19954.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-whois-raw-perl",
"binary_version": "2.43-1.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-whois-raw-perl",
"purl": "pkg:deb/ubuntu/libnet-whois-raw-perl?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"2.99042-1",
"2.99043-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19954.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-whois-raw-perl",
"binary_version": "2.99043-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-whois-raw-perl",
"purl": "pkg:deb/ubuntu/libnet-whois-raw-perl?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"2.43-1.1",
"2.99042-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19954.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-whois-raw-perl",
"binary_version": "2.99042-1"
}
]
}
}
],
"modified": "2026-10-17T12:58:46.883541319Z",
"provider": "osv",
"upstream": [
"CVE-2026-19954"
],
"references": [
"https://ubuntu.com/security/CVE-2026-19954",
"https://www.cve.org/CVERecord?id=CVE-2026-19954"
]
},
"related_cves": [
{
"value": "CVE-2026-19954",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359045,
"published_at": "2026-10-05T07:16:00+00:00"
}