Net::IP::LPM versions before 1.12 for Perl accept malformed prefix lengths.

Non-numeric and non-ASCII prefix lengths are accepted and treated as 0. Integers over 31 bits are silently truncated. A single malformed mask will poison the lookup table.

The result is that the lookup will silently succeed for every address. An allow-list will allow every address, and a deny-list will block every address.

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Advisories

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Fixes

Solution

Upgrade to Net::IP::LPM version 1.12 or later.


Workaround

No workaround given by the vendor.

History

Tue, 08 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 07 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
References

Mon, 07 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Description Net::IP::LPM versions before 1.12 for Perl accept malformed prefix lengths. Non-numeric and non-ASCII prefix lengths are accepted and treated as 0. Integers over 31 bits are silently truncated. A single malformed mask will poison the lookup table. The result is that the lookup will silently succeed for every address. An allow-list will allow every address, and a deny-list will block every address.
Title Net::IP::LPM versions before 1.12 for Perl accept malformed prefix lengths
Weaknesses CWE-1287
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: CPANSec

Published:

Updated: 2026-09-08T18:40:45.091Z

Reserved: 2026-09-06T14:31:43.537Z

Link: CVE-2026-86287

cve-icon Vulnrichment

Updated: 2026-09-07T20:07:31.385Z

cve-icon NVD

Status : Deferred

Published: 2026-09-07T19:17:28.370

Modified: 2026-09-08T19:20:13.267

Link: CVE-2026-86287

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-07T20:00:05Z

Weaknesses