CVE-2026-45191 Details
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.
A vulnerability exists in Net::CIDR::Lite for Perl, specifically in versions prior to 0.24, where the library fails to properly validate CIDR mask inputs. This oversight allows zero-padded masks, such as '/00' and '/01', to pass validation and be parsed into prefixes that could bypass IP Access Control Lists (ACLs). The issue arises because the validation process does not account for extraneous zero characters, enabling certain masks to be interpreted differently than intended. As a result, functions like find() may incorrectly match or miss addresses.
Users are advised to update to Net::CIDR::Lite version 0.24 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 10, 2026CISA-ADP
Assessed May 11, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c.patch | CPANSec | Source CodeVendor |
| https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.24/changes | CPANSec | Release NotesVendor |
| https://www.cve.org/CVERecord?id=CVE-2026-45190 | CPANSec | Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1289 | Improper Validation of Unsafe Equivalence in Input | CPANSec |
Affected Products
| Product | Versions |
|---|---|
| STIGTSP Net::CIDR::Lite | All versions |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | CPANSec |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 11, 2026 | CVE Modified | CISA-ADP |
| May 10, 2026 | New CVE Received | CPANSec |