CPANSA-Net-IP-LPM-2026-86287: Net-IP-LPM vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-09-07T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-09-07T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | 7.5 | Severity | High |
| Original language | Language | en | |
| Also referred to | |||
Vulnerability 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.
Vulnerabilities
CVE-2026-86287
Vulnerability DescriptionNet::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.
| Weakness | CWE-1287 : Improper Validation of Specified Type of Input |
|---|
Product status
Known affected
| Product | Score | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Net-IP-LPM less than 1.12 |
|
Fixed
- Net-IP-LPM greater than or equal 1.12
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-Net-IP-LPM-2026-86287 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-net-ip-lpm-2026-86287.json - https://github.com/robrwo/perl-Net-IP-LPM/commit/814f8baa85537827db8c3b3d251e48db7aca318f.patch external
https://github.com/robrwo/perl-Net-IP-LPM/commit/814f8baa85537827db8c3b3d251e48db7aca318f.patch - https://metacpan.org/release/RRWO/Net-IP-LPM-1.12/changes external
https://metacpan.org/release/RRWO/Net-IP-LPM-1.12/changes - http://www.openwall.com/lists/oss-security/2026/09/07/1 external
http://www.openwall.com/lists/oss-security/2026/09/07/1 - CVE-2026-86287 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-86287
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Mon Sep 7 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/