CVE-2026-12490

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductNlnetlabs Nsd

PublishedJun 25, 2026

First seenJun 25, 2026

Weakness typeCWE-306Missing authentication for critical function CWE-284Improper access control

How to fix

Update

nlnetlabs nsd4.14.3 or later

Vendor advisories

nlnetlabs.nl/downloads/nsd/CVE-2026-12490.txt

Affected products

Product	Affected versions	Fixed in
nlnetlabs nsd	v < 4.14.3	4.14.3

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.