What’s Vulnerable › Vulnerabilities

CVE-2026-45191: 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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-10 · updated 2026-07-24
• Weakness: CWE-1289

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 products

• STIGTSP Net::CIDR::Lite: before 0.24 — fixed in 0.24

How to fix

Upgrade to a fixed version: STIGTSP Net::CIDR::Lite 0.24. Check the vendor advisory for mitigations.

References

• https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c.patch
• https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.24/changes
• https://www.cve.org/CVERecord?id=CVE-2026-45190

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