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Message-ID: <fdb31ed1-a264-4450-a35e-faeb57e3f63d@cpansec.org>
Date: Thu, 4 Jun 2026 17:11:36 +0100
From: Robert Rothenberg <rrwo@...nsec.org>
To: cve-announce@...urity.metacpan.org, oss-security@...ts.openwall.com
Subject: CVE-2026-49942: Net::CIDR::Set versions through 0.20 for Perl did not
validate network masks
========================================================================
CVE-2026-49942 CPAN Security Group
========================================================================
CVE ID: CVE-2026-49942
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 did not validate network
masks
Description
-----------
Net::CIDR::Set versions through 0.20 for Perl did not validate network
masks.
The mask portion of a network mask could contain Unicode digits such as
the Arabic-Indic One (U+0661), or non-digits, which were ignored.
This could allow network masks to accept larger networks.
Leading zeros were also accepted, but treated as decimal instead of
octal. This could lead to confusion about what networks are
acceptable.
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
https://nvd.nist.gov/vuln/detail/CVE-2026-45191
Timeline
--------
- 2026-05-13: Issue reported to CPANSec
- 2026-06-02: Net::CIDR::Set version 0.21 released with fix
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