| Name | CVE-2026-45191 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libnet-cidr-lite-perl (PTS) | bullseye | 0.22-1 | vulnerable |
| bookworm | 0.22-3~deb12u1 | vulnerable |
| trixie | 0.22-3~deb13u1 | vulnerable |
| forky, sid | 0.24-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[bullseye] - libnet-cidr-lite-perl <postponed> (Minor issue, validation)
https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c (0.24)
https://www.openwall.com/lists/oss-security/2026/05/10/7
https://lists.security.metacpan.org/cve-announce/msg/39920370/