CVE & CISA-KEV Catalog

CVE-2026-45191

MEDIUM
6.5
CVSS v3
NVD

Description

Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.

CWE-1289

How to fix

Remediation Available
libnet-cidr-lite-perlDebian
Fixed in:0.22-3~deb12u2CVE-2026-45191
Fixed in:0.22-3~deb13u2CVE-2026-45191
Fixed in:0.24-1CVE-2026-45191
libnet-cidr-lite-perlUbuntu
Fixed in:0.21-1ubuntu0.16.04.1~esm2USN-8453-1
Fixed in:0.21-1ubuntu0.18.04.1~esm2USN-8453-1
Fixed in:0.21-2ubuntu0.1+esm2USN-8453-1
Fixed in:0.22-1ubuntu0.2USN-8453-1
Fixed in:0.22-2ubuntu0.24.04.2USN-8453-1
Fixed in:0.22-2ubuntu0.25.10.2USN-8453-1

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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

ConfidentialityNone
IntegrityLow
AvailabilityLow

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

Exploit Intelligence

0.30%probability of exploitation in 30 days
22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Related Vulnerabilities

Other CWE-1289 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-45179High7.22.6%--
CVE-2026-48710Medium6.51.9%-Fix
CVE-2026-47729Medium6.51.5%-Fix
CVE-2025-62718Critical9.91.2%-Fix
CVE-2026-33515Medium5.31.0%-Fix
CVE-2022-0675Medium5.60.9%-Fix

Common questions

How do I fix CVE-2026-45191?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-45191 being actively exploited?

Not that we know of. CVE-2026-45191 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.30% is the estimated probability that it will be exploited in the next 30 days. That is higher than 22% of all scored CVEs.

How severe is CVE-2026-45191?

CVE-2026-45191 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-45191 affect?

Published advisories record a fix for libnet-cidr-lite-perl (Debian), libnet-cidr-lite-perl (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2026-07-24.