Bug 2468675 (CVE-2026-45191)

Summary: CVE-2026-45191 perl-Net-CIDR-Lite: Net::CIDR::Lite: IP ACL bypass due to improper CIDR mask validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Net::CIDR::Lite. This vulnerability allows an attacker to bypass IP Access Control Lists (ACLs) by providing specially crafted CIDR (Classless Inter-Domain Routing) mask values. The component incorrectly processes mask forms containing extraneous zero characters, such as "/00" or "/01", leading to an unintended bypass of network access restrictions. This could result in unauthorized access.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2488247, 2488248    
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Description OSIDB Bzimport 2026-05-10 21:01:24 UTC 
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.