How severe is CVE-2026-45191?

CVE-2026-45191 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2026-45191 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-45191?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-45191 have an EU (EUVD) identifier?

Yes. CVE-2026-45191 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28999.

When was CVE-2026-45191 published?

CVE-2026-45191 was published on 2026-05-10 and last updated on 2026-06-17.

CVE-2026-45191

CVE-2026-45191 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1289.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28999
Weakness: CWE-1289
Published: 2026-05-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-45191?: 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.
How severe is CVE-2026-45191?: CVE-2026-45191 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2026-45191 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-45191?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-45191 have an EU (EUVD) identifier?: Yes. CVE-2026-45191 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28999.
When was CVE-2026-45191 published?: CVE-2026-45191 was published on 2026-05-10 and last updated on 2026-06-17.

References

Other CWE-1289 vulnerabilities

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