CVE-2026-12490

Bypass of client certificate verification with transfer over TLS

State: Published
Severity: 8.2 High
Published: Jun 25, 2026
Updated: Jun 25, 2026
Reserved: Jun 17, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	NLnet Labs

Weaknesses

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

Affected Products

Product	Versions
NSDNLnet Labs	4.10.1 to before 4.14.3Affected

References

https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12490.txtvendor-advisory

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