CVE-2026-86287

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

Published Sep 7, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

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

Tracking

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Advisories

No advisories available
History
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'}

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

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Weaknesses

Sources

Status
PUBLISHED
Assigner
CPANSec
Published
Updated
Sep 8, 2026, 6:40 PM
Reserved
Sep 6, 2026, 2:31 PM
Status
Deferred
Published
Sep 7, 2026, 7:17 PM
Modified
Sep 8, 2026, 7:20 PM