CVE-2026-86287CWE-1287

CVE-2026-86287

High · published September 7, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
48.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00609 · 48.5th percentile
Weakness
CWE-1287 · Improper Validation of Specified Type of Input
Published
2026-09-07T23:17Z
References (3)
https://github.com/robrwo/perl-Net-IP-LPM/commit/814f8baa85537827db8c3b3d251e48db7aca318f.patch · 9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/RRWO/Net-IP-LPM-1.12/changes · 9b29abf9-4ab0-4765-b253-1875cd9b441ehttp://www.openwall.com/lists/oss-security/2026/09/07/1 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 09 SEP 03:20Z
    EPSS moved — → 0%
    epss
  • 07 SEP 18:25Z
    Net::IP::LPM versions before 1.12 for Perl accept malformed prefix lengths
    cvelistv5