Net::CIDR::Set versions through 0.20 for Perl did not validate network masks

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Summary

CVECVE-2026-49942
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-04 17:16:33 UTC
Updated2026-06-04 19:16:30 UTC
DescriptionNet::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.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Problem Types: CWE-1289 | CWE-1289 CWE-1289 Improper Validation of Unsafe Equivalence in Input

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA RRWO NetCIDRSet affected 0.20 custom Not specified

References

ReferenceSourceLinkTags
nvd.nist.gov/vuln/detail/CVE-2026-45191 9b29abf9-4ab0-4765-b253-1875cd9b441e nvd.nist.gov
nvd.nist.gov/vuln/detail/CVE-2025-40911 9b29abf9-4ab0-4765-b253-1875cd9b441e nvd.nist.gov
metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-05-13T00:00:00.000ZIssue reported to CPANSec
CNA2026-06-02T00:00:00.000ZNet::CIDR::Set version 0.21 released with fix

Solutions

CNA: Upgrade to version 0.21.

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