# CVE-2026-49941: libnet-cidr-set-perl: Net::CIDR::Set versions through 0.20 for Perl did not validate IP addresses

CVE-2026-49941 is fixed in libnet-cidr-set-perl on 1 platform, first by DEBIAN-CVE-2026-49941, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-49941
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0033
- 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 did not validate IP addresses.  The add method called the _encode method to parse addresses. If the addresses did not look like netmasks or network ranges, then they were assumed to single IP addresses and passed back to itself as a 32-bit or 128-bit netmask.  If the argument was not a well-formed IP address, then this would lead to indefinite recursion.  An attacker could use this to cause a denial of service.

## 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-2026-49941](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49941.md) | Jun 24, 2026 |
| Linux | libnet-cidr-set-perl Debian 14 | 0.21-1 | [DEBIAN-CVE-2026-49941](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49941.md) | Jun 24, 2026 |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo