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Nlnet Labs NSDDenial of DNS over TLS service by any DoT client

Risk 49
Severity
8.7
Use After Free
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Last updated 29 June 2026

1 / 2
Source: Ubuntu
First published (updated )
CVE-2026-12245

oss-secSeveral vulnerabilities wefound in NLnet Labs NSD

Several vulnerabilities were found in NLnet Labs NSD. The overview of the vulnerabilities with a brief description is:

CVE-2026-12244 - severity: HIGH Heap overflow and crash with crafted SVCB RR

CVE-2026-12245 - severity: HIGH Denial of DNS over TLS service by any DoT client

CVE-2026-12246 - severity: HIGH Out of bounds stack write with crafted APL RR

CVE-2026-12490 - severity: HIGH Bypass of client certificate verification with transfer over TLS

The patches are tested to apply/work on 4.14.2

Best regards, -- Willem, on behalf of the NSD team.

First published (updated )
https://seclists.org/oss-sec/2026/q2/1029

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