What’s Vulnerable › Vulnerabilities

CVE-2026-49941: Net::CIDR::Set versions through 0.20 for Perl did not validate IP addresses

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-04 · updated 2026-07-22
• Weakness: CWE-674

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.

Affected products

• RRWO Net::Cidr::Set: before 0.21 — fixed in 0.21

How to fix

Upgrade to a fixed version: RRWO Net::Cidr::Set 0.21. Check the vendor advisory for mitigations.

References

• https://metacpan.org/release/RRWO/Net-CIDR-Set-0.21/changes
• http://www.openwall.com/lists/oss-security/2026/06/04/11

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