Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass

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Summary

CVECVE-2026-40198
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-10 22:16:21 UTC
Updated2026-04-21 18:49:34 UTC
DescriptionNet::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass. _pack_ipv6() does not check that uncompressed IPv6 addresses (without ::) have exactly 8 hex groups. Inputs like "abcd", "1:2:3", or "1:2:3:4:5:6:7" are accepted and produce packed values of wrong length (3, 7, or 15 bytes instead of 17). The packed values are used internally for mask and comparison operations. find() and bin_find() use Perl string comparison (lt/gt) on these values, and comparing strings of different lengths gives wrong results. This can cause find() to incorrectly report an address as inside or outside a range. Example: my $cidr = Net::CIDR::Lite->new("::/8"); $cidr->find("1:2:3"); # invalid input, incorrectly returns true This is the same class of input validation issue as CVE-2021-47154 (IPv4 leading zeros) previously fixed in this module. See also CVE-2026-40199, a related issue in the same function affecting IPv4 mapped IPv6 addresses.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

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

EPSS: 0.000470000 probability, percentile 0.146750000 (date 2026-04-22)

Problem Types: CWE-1286 | CWE-1286 CWE-1286 Improper Validation of Syntactic Correctness of Input

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Stigtsp Net \ cidr\ \ lite

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA STIGTSP NetCIDRLite affected 0.23 custom Not specified

References

ReferenceSourceLinkTags
github.com/stigtsp/Net-CIDR-Lite/commit/25d65f85dbe4885959a10471725ec9d2... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com Patch
www.cve.org/CVERecord 9b29abf9-4ab0-4765-b253-1875cd9b441e www.cve.org Third Party Advisory
metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.23/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-04-09T00:00:00.000ZVulnerability found
CNA2026-04-10T00:00:00.000ZNet-CIDR-Lite version 0.23 released

Solutions

CNA: Upgrade to version 0.23 or newer, or apply the patch provided.

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