UBUNTU-CVE-2026-19566

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Source
https://ubuntu.com/security/CVE-2026-19566
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19566.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-19566
Upstream
Published
2026-08-13T00:00:00Z
Modified
2026-08-13T19:30:08.836175768Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Net::CIDR::Set versions before 0.23 for Perl allow memory exhaustion and malformed set ranges via unbounded IPv6 prefix lengths. The _encode method accepts any prefix length matching (0|[1-9][0-9]*) and passes it to _width2bits(), which builds the mask as '1' x ($width + 8), one character per bit. The _inc() method then unpacks the packed mask into a Perl array of one scalar per byte, so the prefix length alone sets the allocation size: ::/100000000 builds a 100 MB string and a 12.5 million element array. The value being tested is parsed, not just the configured ranges: contains() builds a set from its argument, and guesscoder() tries the IPv4 coder and then the IPv6 coder, so an IPv4-only set expands an oversized IPv6 prefix length before the mixed address width check rejects it. Any caller that passes untrusted input to contains() or add() can exhaust process memory. A prefix length above 128 is also stored as a range that does not match the requested block: 2001:db8::/129 stringifies back unchanged, contains() of its own base address returns false, and removing it from a set drops the base address while the set still prints as covering it.

References

Affected packages

Ubuntu:20.04:LTS / libnet-cidr-set-perl

Package

Name
libnet-cidr-set-perl
Purl
pkg:deb/ubuntu/libnet-cidr-set-perl?arch=source&distro=focal

Affected ranges

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

Affected versions

0.*
0.13-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.13-2",
            "binary_name": "libnet-cidr-set-perl"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19566.json"

Ubuntu:22.04:LTS / libnet-cidr-set-perl

Package

Name
libnet-cidr-set-perl
Purl
pkg:deb/ubuntu/libnet-cidr-set-perl?arch=source&distro=jammy

Affected ranges

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

Affected versions

0.*
0.13-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.13-3",
            "binary_name": "libnet-cidr-set-perl"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19566.json"

Ubuntu:24.04:LTS / libnet-cidr-set-perl

Package

Name
libnet-cidr-set-perl
Purl
pkg:deb/ubuntu/libnet-cidr-set-perl?arch=source&distro=noble

Affected ranges

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

Affected versions

0.*
0.13-4
0.13-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.13-5",
            "binary_name": "libnet-cidr-set-perl"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19566.json"

Ubuntu:26.04:LTS / libnet-cidr-set-perl

Package

Name
libnet-cidr-set-perl
Purl
pkg:deb/ubuntu/libnet-cidr-set-perl?arch=source&distro=resolute

Affected ranges

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

Affected versions

0.*
0.19-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.19-1",
            "binary_name": "libnet-cidr-set-perl"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19566.json"