CVE-2026-12245
Denial of DNS over TLS service by any DoT client
Description
NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.
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
- Update NSD to a version that addresses the memory corruption.
- Apply vendor patches for TLS error handling.
- Restart the affected server process.
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