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Message-ID: <de5d8e03-86d3-48d7-a8c3-d26107f2c51f@cpansec.org>
Date: Thu, 4 Jun 2026 17:09:26 +0100
From: Robert Rothenberg <rrwo@...nsec.org>
To: cve-announce@...urity.metacpan.org, oss-security@...ts.openwall.com
Subject: CVE-2026-49940: Net::CIDR::Set versions through 0.20 for Perl accept
non-ASCII IP addresses and netmasks
========================================================================
CVE-2026-49940 CPAN Security Group
========================================================================
CVE ID: CVE-2026-49940
Distribution: Net-CIDR-Set
Versions: through 0.20
MetaCPAN: https://metacpan.org/dist/Net-CIDR-Set
VCS Repo: https://github.com/robrwo/perl-Net-CIDR-Set
Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP
addresses and netmasks
Description
-----------
Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP
addresses and netmasks.
Unicode digits such as the Arabic-Indic One (U+0661) were accepted but
not properly parsed as numbers. This could allow network masks to
accept larger networks.
Problem types
-------------
- CWE-1289 Improper Validation of Unsafe Equivalence in Input
Solutions
---------
Upgrade to version 0.21.
References
----------
https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes
https://nvd.nist.gov/vuln/detail/CVE-2025-40911
Timeline
--------
- 2026-05-13: Issue reported to CPANSec
- 2026-06-02: Net::CIDR::Set version 0.21 released with fix
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