CVE-2026-12490
Bypass of client certificate verification with transfer over TLS
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.
INFO
Published Date :
June 25, 2026, 5:24 a.m.
Last Modified :
June 25, 2026, 5:24 a.m.
Remotely Exploit :
No
Source :
NLnet Labs
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 206fc3a0-e175-490b-9eaa-a5738056c9f6 |
Solution
- Configure TLS authentication to enforce client certificates for provide-xfr.
- Verify TLS and TCP port configurations for provide-xfr rules.
- Review TLS authentication name settings for provide-xfr.
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