Description
The Net::CIDR::Lite module before 0.22 for Perl does not properly consider extraneous zero characters at the beginning of an IP address string, which (in some situations) allows attackers to bypass access control that is based on IP addresses.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libnet-cidr-lite-perl | 0.22-1 | — |
| Debian 13 | libnet-cidr-lite-perl | 0.22-1 | — |
| Debian 12 | libnet-cidr-lite-perl | 0.22-1 | — |
| Debian 10 | libnet-cidr-lite-perl | 0.21-2+debu10u1 | DLA-3770-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libnet-cidr-lite-perl | 0.22-2ubuntu0.26.04.1 | USN-8406-1 |
| Ubuntu 25.10 | libnet-cidr-lite-perl | 0.22-2ubuntu0.25.10.1 | USN-8406-1 |
| Ubuntu 24.04 LTS | libnet-cidr-lite-perl | 0.22-2ubuntu0.24.04.1 | USN-8406-1 |
| Ubuntu 22.04 LTS | libnet-cidr-lite-perl | 0.22-1ubuntu0.1 | USN-8406-1 |
| Ubuntu 20.04 LTS | libnet-cidr-lite-perl | 0.21-2ubuntu0.1 | USN-6712-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libnet-cidr-lite-perl | 0.21-2ubuntu0.1+esm1 | USN-8406-1 |
| Ubuntu Pro 18.04 LTS | libnet-cidr-lite-perl | 0.21-1ubuntu0.18.04.1~esm1 | USN-8406-1 |
| Ubuntu Pro 16.04 LTS | libnet-cidr-lite-perl | 0.21-1ubuntu0.16.04.1~esm1 | USN-8406-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | perl-Net-CIDR-Lite | 0.21-150100.6.3.1 | SUSE-SU-2024:1256-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.5 | perl-Net-CIDR-Lite | 0.21-150100.6.3.1 | SUSE-SU-2024:1256-1 |
Advisories 4
- USN-8406-1 libnet-cidr-lite-perl vulnerabilities Ubuntu Security Notices (USN) · Jun 8, 2026
- USN-6712-1 libnet-cidr-lite-perl vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3770-1 libnet-cidr-lite-perl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2024:1256-1 Security update for perl-Net-CIDR-Lite SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://blog.urth.org/2021/03/29/security-issues-in-perl-ip-address-distros/
- https://metacpan.org/pod/Net::CIDR::Lite
- https://github.com/stigtsp/Net-CIDR-Lite/commit/23b6ff0590dc279521863a502e890ef19a5a76fc
- https://metacpan.org/dist/Net-CIDR-Lite/changes
- [debian-lts-announce] 20240323 [SECURITY] [DLA 3770-1] libnet-cidr-lite-perl security update mailing-list