What’s Vulnerable › Vulnerabilities
CVE-2026-12490: Bypass of client certificate verification with transfer over TLS
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-25 · updated 2026-10-25
- Weakness: CWE-284
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.
Affected products
- NLnet Labs NSD: before 4.14.3 — fixed in 4.14.3
How to fix
Upgrade to a fixed version: NLnet Labs NSD 4.14.3. Check the vendor advisory for mitigations.
References
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