CVE-2026-12245
Denial of DNS over TLS service by any DoT client
- State
- Published
- Severity
- 8.7 High
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Reserved
- Jun 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | NLnet Labs |
Weaknesses
- CWE-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
NSDNLnet Labs |
|
References
- https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12245.txtvendor-advisory
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