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[USN-8453-1] Net::CIDR::Lite vulnerabilities

Posted on 18 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8453-1
June 18, 2026

libnet-cidr-lite-perl vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Net::CIDR::Lite.

Software Description:
- libnet-cidr-lite-perl: module for merging IPv4 or IPv6 CIDR address ranges

Details:

It was discovered that Net::CIDR::Lite incorrectly validated IP address and
CIDR mask inputs. An attacker could possibly use this issue to bypass IP
access control lists. (CVE-2026-45190)

It was discovered that Net::CIDR::Lite incorrectly handled extraneous zero
characters in CIDR mask values. An attacker could possibly use this issue
to bypass IP access control lists. (CVE-2026-45191)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libnet-cidr-lite-perl 0.22-2ubuntu0.26.04.2

Ubuntu 25.10
libnet-cidr-lite-perl 0.22-2ubuntu0.25.10.2

Ubuntu 24.04 LTS
libnet-cidr-lite-perl 0.22-2ubuntu0.24.04.2

Ubuntu 22.04 LTS
libnet-cidr-lite-perl 0.22-1ubuntu0.2

Ubuntu 20.04 LTS
libnet-cidr-lite-perl 0.21-2ubuntu0.1+esm2
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libnet-cidr-lite-perl 0.21-1ubuntu0.18.04.1~esm2
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libnet-cidr-lite-perl 0.21-1ubuntu0.16.04.1~esm2
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8453-1
CVE-2026-45190, CVE-2026-45191

Package Information:
https://launchpad.net/ubuntu/+source/libnet-cidr-lite-perl/0.22-2ubuntu0.26.04.2
https://launchpad.net/ubuntu/+source/libnet-cidr-lite-perl/0.22-2ubuntu0.25.10.2
https://launchpad.net/ubuntu/+source/libnet-cidr-lite-perl/0.22-2ubuntu0.24.04.2
https://launchpad.net/ubuntu/+source/libnet-cidr-lite-perl/0.22-1ubuntu0.2

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