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.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12245.txt
Scores
CVSS v3
7.5
EPSS
0.0032
EPSS Percentile
24.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-416
Status
published
Products (2)
NLnet Labs/NSD
4.13.0 - 4.14.3
nlnetlabs/nsd
4.13.0 - 4.14.3
Published
Jun 25, 2026
Tracked Since
Jun 25, 2026