Critical
libnet-dns-perl — security advisory
Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR. Net::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:`""`} in EXTRA-TEXT.
- Products
- libnet-dns-perl
- Affected versions
- 0.68-1.2, 0.68-1.2build1, 0.81-2, 0.81-2build1, 1.10-2, 1.20-1, 1.21-1, 1.22-1, 1.29-1, 1.32-1, 1.33-1, 1.39-2ubuntu1, 1.40-1ubuntu1, 1.44-1ubuntu1, 1.50-1ubuntu1, 1.53-1ubuntu1, 1.54-1ubuntu1, 1.55-1ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-64193
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:12 UTC · Revision 1
Source evidence
Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR. Net::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:`""`} in EXTRA-TEXT.
osv:UBUNTU-CVE-2026-64193
libnet-dns-perl
Fixed versions: Not specified
libnet-dns-perl
Fixed versions: Not specified
libnet-dns-perl
Fixed versions: Not specified
libnet-dns-perl
Fixed versions: Not specified
libnet-dns-perl
Fixed versions: Not specified
libnet-dns-perl
Fixed versions: Not specified
libnet-dns-perl
Fixed versions: Not specified
libnet-dns-perl
Fixed versions: Not specified
Complete source record
{
"id": "6448b18e6159cf7bded3de3f6a36d1b2ed299cd01f52bca4ac3ee98b126b75f4",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-64193",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-64193",
"summary": "Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR. Net::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:`\"\"`} in EXTRA-TEXT.",
"evidence": "osv:UBUNTU-CVE-2026-64193",
"products": [
{
"name": {
"value": "libnet-dns-perl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.68-1.2",
"evidence": "/affected/0/versions"
},
{
"value": "0.68-1.2build1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libnet-dns-perl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.81-2",
"evidence": "/affected/1/versions"
},
{
"value": "0.81-2build1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libnet-dns-perl",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.10-2",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "libnet-dns-perl",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.20-1",
"evidence": "/affected/3/versions"
},
{
"value": "1.21-1",
"evidence": "/affected/3/versions"
},
{
"value": "1.22-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "libnet-dns-perl",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.29-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.32-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.33-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "libnet-dns-perl",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.39-2ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "1.40-1ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "1.44-1ubuntu1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "libnet-dns-perl",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.54-1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "1.55-1ubuntu1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "libnet-dns-perl",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.50-1ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "1.53-1ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "1.54-1ubuntu1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-64193",
"aliases": [
"UBUNTU-CVE-2026-64193"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-dns-perl",
"purl": "pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=trusty",
"ecosystem": "Ubuntu:14.04:LTS"
},
"versions": [
"0.68-1.2",
"0.68-1.2build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-dns-perl",
"binary_version": "0.68-1.2build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-dns-perl",
"purl": "pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"0.81-2",
"0.81-2build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-dns-perl",
"binary_version": "0.81-2build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-dns-perl",
"purl": "pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1.10-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-dns-perl",
"binary_version": "1.10-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-dns-perl",
"purl": "pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1.20-1",
"1.21-1",
"1.22-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-dns-perl",
"binary_version": "1.22-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-dns-perl",
"purl": "pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1.29-1",
"1.32-1",
"1.33-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-dns-perl",
"binary_version": "1.33-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-dns-perl",
"purl": "pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1.39-2ubuntu1",
"1.40-1ubuntu1",
"1.44-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-dns-perl",
"binary_version": "1.44-1ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-dns-perl",
"purl": "pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1.54-1ubuntu1",
"1.55-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-dns-perl",
"binary_version": "1.55-1ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-dns-perl",
"purl": "pkg:deb/ubuntu/libnet-dns-perl?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.50-1ubuntu1",
"1.53-1ubuntu1",
"1.54-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-64193.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-dns-perl",
"binary_version": "1.54-1ubuntu1"
}
]
}
}
],
"modified": "2026-10-17T13:00:33.588360584Z",
"provider": "osv",
"upstream": [
"CVE-2026-64193"
],
"references": [
"https://ubuntu.com/security/CVE-2026-64193",
"https://www.cve.org/CVERecord?id=CVE-2026-64193",
"https://lists.security.metacpan.org/cve-announce/msg/41989543/",
"https://rt.cpan.org/Ticket/Display.html?id=179945"
]
},
"related_cves": [
{
"value": "CVE-2026-64193",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360690,
"published_at": "2026-07-20T19:17:00+00:00"
}