Net::CIDR::Set versions through 0.20 for Perl did not validate IP addresses

Published 5 mo ago 2026-06-04 · modified 3 mo ago 2026-07-22 · JSON

CVSS

7.5

v3.1 · CNA

CISA KEV

not known exploited

EPSS

0.3%

percentile 26%

Public exploits

none known

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.

CISA SSVC assessment

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 5 mo ago 2026-06-04

Exploit prediction (EPSS)

0.33% probability of exploitation in the next 30 days, higher than 26% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
CISA ADP	3.1	7.5	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CNA	3.1	7.5	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Affected products

RRWO Net::CIDR::Set

Classification

Weakness

CWE-1287 Improper Validation of Specified Type of Input
CWE-674 Uncontrolled Recursion

References

metacpan.org /release/RRWO/Net-CIDR-Set-0.21/changes · release-notes
openwall.com /lists/oss-security/2026/06/04/11

Sources

CVE List: CVE-2026-49941
NVD: CVE-2026-49941

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.

Summary