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CVE-2026-40198— Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass

Quick assessment

Affected
STIGTSP Net::CIDR::Lite
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Net-CIDR-Lite是Stig个人开发者的一个用于处理CIDR地址的Perl模块。 Net-CIDR-Lite 0.23之前版本存在安全漏洞，该漏洞源于未验证IPv6组数量，可能导致IP访问控制列表绕过。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40198

Vulnerability Information
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Vulnerability Title
Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1286
Source: CVE Program / CVE List V5
Vulnerability Title
Net-CIDR-Lite 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Net-CIDR-Lite是Stig个人开发者的一个用于处理CIDR地址的Perl模块。 Net-CIDR-Lite 0.23之前版本存在安全漏洞，该漏洞源于未验证IPv6组数量，可能导致IP访问控制列表绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
STIGTSP Net::CIDR::Lite 0 ~ 0.23 -

II. Public POCs for CVE-2026-40198

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III. Intelligence Information for CVE-2026-40198

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Patches & Fixes for CVE-2026-40198 (1)

Vendor Advisories for CVE-2026-40198 (1)

Other References for CVE-2026-40198 (1)

IV. Related Vulnerabilities

Same product: Net::CIDR::Lite
Same vendor: STIGTSP
Same weakness: CWE-1286

V. Comments for CVE-2026-40198

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