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Fencer Vulns
high 7.5

CVE-2026-49941 json

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

published 2026-06-04 5 mo ago modified 2026-07-22 3 mo ago also EUVD-2026-34298

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

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.

Patch / fix

  • rrwo net::cidr::set 0.21
  • libnet-cidr-set-perl Debian 13 0.15-1+deb13u1
  • libnet-cidr-set-perl Debian 14 0.21-1

debian advisories DEBIAN-CVE-2026-49941

  • perl-Net-CIDR-Set openSUSE Tumbleweed 0.210.0-1.1

opensuse advisories openSUSE-SU-2026:10951-1

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

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

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.