Is CVE-2026-42255 in the CISA KEV catalog?

No. CVE-2026-42255 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-42255?

CVE-2026-42255 has a CVSS v3 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2026-42255?

CVE-2026-42255 has an EPSS score of 0.21% (11th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42255?

Upgrade dnsserver to 15.0 or later.

CVE & CISA-KEV Catalog

CVE-2026-42255

HIGH

7.2

CVSS v3

NVD

Description

Technitium DNS Server before 15.0 allows DNS traffic amplification via cyclic name server delegation.

CWE-684

How to fix

Remediation Available

dnsserverNVD

Affected:< 15.0Fixed in:15.0CVE-2026-42255derived from NVD

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

ScopeChanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.21%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

Release Notes1

github.com

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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 2026-04-29.