# CVE-2026-49940: libnet-cidr-set-perl: Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks

CVE-2026-49940 is fixed in libnet-cidr-set-perl on 1 platform, first by DEBIAN-CVE-2026-49940, released June 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-49940
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 4, 2026

## Description

Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks.  Unicode digits such as the Arabic-Indic One (U+0661) were accepted but not properly parsed as numbers.  This could allow network masks to accept larger networks.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libnet-cidr-set-perl Debian 13.5 (trixie) | 0.15-1+deb13u1 | [DEBIAN-CVE-2026-49940](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49940.md) | Jun 24, 2026 |
| Linux | libnet-cidr-set-perl Debian 14 | 0.21-1 | [DEBIAN-CVE-2026-49940](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49940.md) | Jun 24, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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