ubuntu-cve-2026-45191
Vulnerability from osv_ubuntu
Published
2026-06-15 00:00
Modified
2026-06-24 09:02
Summary
Details
Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libnet-cidr-lite-perl",
"binary_version": "0.21-1ubuntu0.16.04.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "libnet-cidr-lite-perl",
"purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.21-1ubuntu0.16.04.1~esm2?arch=source\u0026distro=esm-apps-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.21-1ubuntu0.16.04.1~esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.21-1",
"0.21-1ubuntu0.16.04.1~esm1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libnet-cidr-lite-perl",
"binary_version": "0.21-1ubuntu0.18.04.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "libnet-cidr-lite-perl",
"purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.21-1ubuntu0.18.04.1~esm2?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.21-1ubuntu0.18.04.1~esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.21-1",
"0.21-1ubuntu0.18.04.1~esm1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libnet-cidr-lite-perl",
"binary_version": "0.21-2ubuntu0.1+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "libnet-cidr-lite-perl",
"purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.21-2ubuntu0.1+esm2?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.21-2ubuntu0.1+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.21-2",
"0.21-2ubuntu0.1",
"0.21-2ubuntu0.1+esm1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnet-cidr-lite-perl",
"binary_version": "0.22-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libnet-cidr-lite-perl",
"purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-1ubuntu0.2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.22-1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.22-1",
"0.22-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnet-cidr-lite-perl",
"binary_version": "0.22-2ubuntu0.24.04.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libnet-cidr-lite-perl",
"purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-2ubuntu0.24.04.2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.22-2ubuntu0.24.04.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.22-2",
"0.22-2ubuntu0.24.04.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnet-cidr-lite-perl",
"binary_version": "0.22-2ubuntu0.25.10.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "libnet-cidr-lite-perl",
"purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-2ubuntu0.25.10.2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.22-2ubuntu0.25.10.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.22-2",
"0.22-2ubuntu0.25.10.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnet-cidr-lite-perl",
"binary_version": "0.22-2ubuntu0.26.04.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libnet-cidr-lite-perl",
"purl": "pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-2ubuntu0.26.04.2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.22-2ubuntu0.26.04.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.22-2",
"0.22-2ubuntu0.26.04.1"
]
}
],
"aliases": [],
"details": "Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like \"/00\" and \"/01\" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.",
"id": "UBUNTU-CVE-2026-45191",
"modified": "2026-06-24T09:02:14Z",
"published": "2026-06-15T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-45191"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-45191"
},
{
"type": "REPORT",
"url": "https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c"
},
{
"type": "REPORT",
"url": "https://www.openwall.com/lists/oss-security/2026/05/10/7"
},
{
"type": "REPORT",
"url": "https://lists.security.metacpan.org/cve-announce/msg/39920370/"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8453-1"
}
],
"related": [
"USN-8453-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-45191"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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