Is CVE-2026-12490 in the CISA KEV catalog?

No. CVE-2026-12490 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-12490?

CVE-2026-12490 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2026-12490?

CVE-2026-12490 has an EPSS score of 0.14% (4th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-12490?

Upgrade nsd on debian unstable to 4.14.3-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2026-12490

HIGH

7.5

CVSS v3

NVD

Description

When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.

CWE-284Improper Access Control CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

nsdDebian

Fixed in:4.14.3-1CVE-2026-12490

nsdUbuntu

Fixed in:4.1.7-1ubuntu0.1~esm1USN-8474-1

Fixed in:4.1.17-1ubuntu0.1~esm1USN-8474-1

Fixed in:4.1.26-1ubuntu0.1~esm1USN-8474-1

Fixed in:4.3.9-1ubuntu0.1~esm1USN-8474-1

Fixed in:4.8.0-1ubuntu0.1~esm1USN-8474-1

nsd3Ubuntu

Fixed in:4.1.7-1ubuntu0.1~esm1USN-8474-1

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

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.14%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Patch1

nlnetlabs.nl

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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 2026-06-26.