Is CVE-2026-49940 in the CISA KEV catalog?

No. CVE-2026-49940 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-49940?

CVE-2026-49940 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-49940?

CVE-2026-49940 has an EPSS score of 0.20% (9th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-49940?

Upgrade libnet-cidr-set-perl on debian unstable to 0.21-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-49940

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-1289

How to fix

Remediation Available

libnet-cidr-set-perlDebian

Fixed in:0.21-1CVE-2026-49940

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploit Intelligence

0.20%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Third-Party Advisory1

nvd.nist.gov

Release Notes1

metacpan.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-08.