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TI-2026-29012 Aliases CVE-2026-40198GHSA-c25q-mqx5-m6v8

Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which…

Priority LOW 39CWE-1286Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00315 24th percentileScored 2026-11-07
Fix Fixed Net::CIDR::Lite (STIGTSP): 0.23

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
STIGTSPNet::CIDR::Litebefore 0.230.23Patch availableCNA
  • Net::CIDR::Lite VendorSTIGTSP Affected before 0.23 Fixed in 0.23 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:stigtsp:net\:\:cidr\:\:lite:*:*:*:*:*:perl:*:* cidr\VulnerableSTIGTSP
  • cpe:2.3:a:stigtsp:net\:\:cidr\:\:lite:*:*:*:*:*:perl:*:* Versions cidr\ Vulnerable ·STIGTSP

Remediation

  • Fix · CNA Net::CIDR::Lite (STIGTSP) Fixed in 0.23

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    STIGTSP Net::CIDR::Lite 0.23

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-29013 Net::CIDR::Lite versions before 0.23 for Perl mishandles IPv4 mapped IPv6 addresses…Priority LOW 35
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40198
  2. 2026-10-03 Alias added: GHSA-c25q-mqx5-m6v8

References

Patch 1

Advisory 1

Other 1

  • TI-2026-29013 Net::CIDR::Lite versions before 0.23 for Perl mishandles IPv4 mapped IPv6 addresses… CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences