Ubuntu USN · USN-8453-1

Net::CIDR::Lite vulnerabilities

Published: Thu, 18 Jun 2026 16:15

CVE-2026-45191CVE-2026-45190

Summary

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

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)

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu bionic

libnet-cidr-lite-perl→0.21-1ubuntu0.18.04.1~esm2apt_upgrade_esm
Fixed at 0.21-1ubuntu0.18.04.1~esm2 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl=0.21-1ubuntu0.18.04.1~esm2
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
libnet-cidr-lite-perl→0.21-1ubuntu0.18.04.1~esm2apt_upgrade_esm
Fixed at 0.21-1ubuntu0.18.04.1~esm2 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl=0.21-1ubuntu0.18.04.1~esm2
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu focal

libnet-cidr-lite-perl→0.21-2ubuntu0.1+esm2apt_upgrade
Standard apt upgrade. Install 0.21-2ubuntu0.1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libnet-cidr-lite-perl→0.21-2ubuntu0.1+esm2apt_upgrade
Standard apt upgrade. Install 0.21-2ubuntu0.1+esm2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu jammy

libnet-cidr-lite-perl→0.22-1ubuntu0.2apt_upgrade
Standard apt upgrade. Install 0.22-1ubuntu0.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libnet-cidr-lite-perl→0.22-1ubuntu0.2apt_upgrade
Standard apt upgrade. Install 0.22-1ubuntu0.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu noble

libnet-cidr-lite-perl→0.22-2ubuntu0.24.04.2apt_upgrade
Standard apt upgrade. Install 0.22-2ubuntu0.24.04.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libnet-cidr-lite-perl→0.22-2ubuntu0.24.04.2apt_upgrade
Standard apt upgrade. Install 0.22-2ubuntu0.24.04.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu questing

libnet-cidr-lite-perl→0.22-2ubuntu0.25.10.2apt_upgrade
Standard apt upgrade. Install 0.22-2ubuntu0.25.10.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libnet-cidr-lite-perl→0.22-2ubuntu0.25.10.2apt_upgrade
Standard apt upgrade. Install 0.22-2ubuntu0.25.10.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu resolute

libnet-cidr-lite-perl→0.22-2ubuntu0.26.04.2apt_upgrade
Standard apt upgrade. Install 0.22-2ubuntu0.26.04.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
libnet-cidr-lite-perl→0.22-2ubuntu0.26.04.2apt_upgrade
Standard apt upgrade. Install 0.22-2ubuntu0.26.04.2 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu xenial

libnet-cidr-lite-perl→0.21-1ubuntu0.16.04.1~esm2apt_upgrade_esm
Fixed at 0.21-1ubuntu0.16.04.1~esm2 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl=0.21-1ubuntu0.16.04.1~esm2
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
libnet-cidr-lite-perl→0.21-1ubuntu0.16.04.1~esm2apt_upgrade_esm
Fixed at 0.21-1ubuntu0.16.04.1~esm2 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y libnet-cidr-lite-perl=0.21-1ubuntu0.16.04.1~esm2
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

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