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TI-2026-29013 Aliases CVE-2026-40199GHSA-932w-96j4-j35v

Net::CIDR::Lite versions before 0.23 for Perl mishandles IPv4 mapped IPv6 addresses…

Priority LOW 35CWE-130Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · 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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00313 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-2026-29012 Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which…Priority LOW 39
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40199
  2. 2026-10-03 Alias added: GHSA-932w-96j4-j35v

References

Patch 1

Advisory 1

Other 1

  • TI-2026-29012 Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which… CVSS 3.1HIGH 7.5

Sources

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