CVE-2026-12245 · Symaro Security Advisory

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.

Severity (CVSS)

Base score	8.7
Severity	High
Version	CVSS 4.0
Vector	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
Provided by	CNA

Weaknesses

CWE-416 — CWE-416: Use After Free

Affected products

Vendor	Product	Versions
NLnet Labs	NSD	4.13.0 to <4.14.3

References

https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12245.txt (vendor-advisory)

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 25 Jun 2026 10:14 UTC.