CVE-2026-12245

HIGH

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.

CVSS v3.1 Score

7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Published: 6/25/2026Modified: 6/26/2026

Related Intelligence (1)

HIGHVulnerability

NVD HIGH: CVE-2026-12245 — NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS c...

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.

CVE-2026-12245
NIST NVD

References (1)

https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12245.txtPatchVendor Advisory