Vulnerability · Published May 10, 2026 · Assigned by CPANSec
CVE-2026-45191Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass
Medium 6.5
In plain English
A medium-severity security flaw in Net::CIDR::Lite from STIGTSP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 77.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | perl-net-cidr-lite | 0.24-r0 | ALPINE-CVE-2026-45191 |
| Debian:12 | libnet-cidr-lite-perl | 0.22-3~deb12u2 | DEBIAN-CVE-2026-45191 |
| Debian:13 | libnet-cidr-lite-perl | 0.22-3~deb13u2 | DEBIAN-CVE-2026-45191 |
| Debian:14 | libnet-cidr-lite-perl | 0.24-1 | DEBIAN-CVE-2026-45191 |
| Ubuntu:22.04:LTS | libnet-cidr-lite-perl | 0.22-1ubuntu0.2 | USN-8453-1 |
| Ubuntu:22.04:LTS | libnet-cidr-lite-perl | 0.22-1ubuntu0.2 | UBUNTU-CVE-2026-45191 |
| Ubuntu:24.04:LTS | libnet-cidr-lite-perl | 0.22-2ubuntu0.24.04.2 | USN-8453-1 |
| Ubuntu:24.04:LTS | libnet-cidr-lite-perl | 0.22-2ubuntu0.24.04.2 | UBUNTU-CVE-2026-45191 |
| Ubuntu:25.10 | libnet-cidr-lite-perl | 0.22-2ubuntu0.25.10.2 | USN-8453-1 |
| Ubuntu:25.10 | libnet-cidr-lite-perl | 0.22-2ubuntu0.25.10.2 | UBUNTU-CVE-2026-45191 |
| Ubuntu:26.04:LTS | libnet-cidr-lite-perl | 0.22-2ubuntu0.26.04.2 | UBUNTU-CVE-2026-45191 |
| Ubuntu:26.04:LTS | libnet-cidr-lite-perl | 0.22-2ubuntu0.26.04.2 | USN-8453-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| STIGTSP | Net::CIDR::Lite | 0 – before 0.24 |
Weakness: CWE-1289 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L