UBUNTU-CVE-2026-40198

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Source
https://ubuntu.com/security/CVE-2026-40198
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40198.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-40198
Upstream
Published
2026-04-10T22:16:00Z
Modified
2026-04-27T20:15:38.404104Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass. packipv6() does not check that uncompressed IPv6 addresses (without ::) have exactly 8 hex groups. Inputs like "abcd", "1:2:3", or "1:2:3:4:5:6:7" are accepted and produce packed values of wrong length (3, 7, or 15 bytes instead of 17). The packed values are used internally for mask and comparison operations. find() and bin_find() use Perl string comparison (lt/gt) on these values, and comparing strings of different lengths gives wrong results. This can cause find() to incorrectly report an address as inside or outside a range. Example: my $cidr = Net::CIDR::Lite->new("::/8"); $cidr->find("1:2:3"); # invalid input, incorrectly returns true This is the same class of input validation issue as CVE-2021-47154 (IPv4 leading zeros) previously fixed in this module. See also CVE-2026-40199, a related issue in the same function affecting IPv4 mapped IPv6 addresses.

References

Affected packages

Ubuntu:16.04:LTS
libnet-cidr-lite-perl

Package

Name
libnet-cidr-lite-perl
Purl
pkg:deb/ubuntu/libnet-cidr-lite-perl@0.21-1?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.21-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.21-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40198.json"
Ubuntu:18.04:LTS
libnet-cidr-lite-perl

Package

Name
libnet-cidr-lite-perl
Purl
pkg:deb/ubuntu/libnet-cidr-lite-perl@0.21-1?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.21-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.21-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40198.json"
Ubuntu:20.04:LTS
libnet-cidr-lite-perl

Package

Name
libnet-cidr-lite-perl
Purl
pkg:deb/ubuntu/libnet-cidr-lite-perl@0.21-2ubuntu0.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.21-2
0.21-2ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.21-2ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40198.json"
Ubuntu:22.04:LTS
libnet-cidr-lite-perl

Package

Name
libnet-cidr-lite-perl
Purl
pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.22-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.22-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40198.json"
Ubuntu:24.04:LTS
libnet-cidr-lite-perl

Package

Name
libnet-cidr-lite-perl
Purl
pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.22-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.22-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40198.json"
Ubuntu:25.10
libnet-cidr-lite-perl

Package

Name
libnet-cidr-lite-perl
Purl
pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-2?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.22-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.22-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40198.json"
Ubuntu:26.04
libnet-cidr-lite-perl

Package

Name
libnet-cidr-lite-perl
Purl
pkg:deb/ubuntu/libnet-cidr-lite-perl@0.22-2?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.22-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnet-cidr-lite-perl",
            "binary_version": "0.22-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40198.json"