Amazon Linux 2023 : perl-Net-CIDR-Lite (ALAS2023-2026-1624)

high Nessus Plugin ID 311311

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1624 advisory.

Net::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.
(CVE-2026-40198)

Net::CIDR::Lite versions before 0.23 for Perl mishandles IPv4 mapped IPv6 addresses, which may allow IP ACL bypass.

_pack_ipv6() includes the sentinel byte from _pack_ipv4() when building the packed representation of IPv4 mapped addresses like ::ffff:192.168.1.1. This produces an 18 byte value instead of 17 bytes, misaligning the IPv4 part of the address.

The wrong length causes incorrect results in mask operations (bitwise AND truncates to the shorter operand) and in find() / bin_find() which use Perl string comparison (lt/gt). This can cause find() to incorrectly match or miss addresses.

Example:

my $cidr = Net::CIDR::Lite->new(::ffff:192.168.1.0/120);$cidr->find(::ffff:192.168.2.0); # incorrectly returns true

This is triggered by valid RFC 4291 IPv4 mapped addresses (::ffff:x.x.x.x).

See also CVE-2026-40198, a related issue in the same function affecting malformed IPv6 addresses.
(CVE-2026-40199)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'dnf update perl-Net-CIDR-Lite --releasever 2023.11.20260427' or or 'dnf update --advisory ALAS2023-2026-1624 --releasever 2023.11.20260427' to update your system.

Plugin Details

Severity: High

ID: 311311

File Name: al2023_ALAS2023-2026-1624.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 4/30/2026

Updated: 4/30/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2026-40198

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:perl-net-cidr-lite

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 4/30/2026

Vulnerability Publication Date: 4/10/2026

Reference Information

CVE: CVE-2026-40198, CVE-2026-40199

Detections

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