CVE-2026-12245

A flaw was found in NSD. When NSD is configured with DNS over TLS DoT, a remote attacker can exploit a vulnerability by performing a TLS action and then prematurely closing the connection. This action causes the server process to crash and restart. By repeatedly exploiting this flaw, an attacker...

CVE-2026-12246

A flaw was found in NSD. A remote attacker, operating as a configured primary DNS server in a multi-tenant secondary DNS deployment, could exploit a bug involving specially crafted Address Prefix List APL resource records. By providing an APL record with an adflength larger than permitted, the...

CVE-2026-12244

A flaw was found in nsd. When nsd is configured as a secondary server for a zone, a remote attacker, acting as the primary server for that zone, can send a specially crafted DNS message within an AXFR Asynchronous Full Zone Transfer request. This message, containing a malformed SVCB Service Bindi...

Linux Distros Unpatched Vulnerability : CVE-2026-12246

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack wh...

EUVD-2026-39182

If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an uint16t variable that is used to allocate space needed for the RR wrap because total size 65535,...

CVE-2026-12246

NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes...

CVE-2026-12244

If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an uint16t variable that is used to allocate space needed for the RR wrap because total size 65535,...

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

NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes...

CVE-2026-12246

NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes...

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

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

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-2026-12244

If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an uint16t variable that is used to allocate space needed for the RR wrap because total size 65535,...

CVE-2026-12244

NSD (the DNS server) is affected when configured as a secondary for a zone. A primary can crash NSD by sending an AXFR containing a DNS message with a specially crafted SVCB RR whose rdata size is 65512, which causes an (uint16_t) length to overflow while allocating space for the RR wrap (total s...

The vulnerability of NSD and Unbound DNS servers lies in the improper handling of symbolic links before accessing a file. This allows attackers to cause service failures.

The vulnerability of NSD and Unbound DNS servers is related to the incorrect handling of symbolic links before accessing a file. Exploiting this vulnerability allows an attacker to cause service failures...

Local symlink attack in Unbound and NSD

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Unbound Backlink Vulnerability

Unbound is a DNS resolver from the NLnet Labs Nlnet Labs Foundation in the Netherlands that supports verified recursion and caching. A security vulnerability exists in NLnet Labs Unbound version 1.12.0 and earlier and NLnet Labs NSD version 4.3.3 and earlier that allows a local symbolic link...

FreeBSD Denial of Service Vulnerability (CNVD-2019-40092)

FreeBSD is a set of Unix-like operating systems from the FreeBSD Foundation.NSD is one of the name server daemons. A denial of service vulnerability exists in FreeBSD NSD versions prior to 3.2.13, which can be exploited by remote attackers to cause a denial of service crash...

DEBIAN-CVE-2016-6173

NSD before 4.1.11 allows remote DNS master servers to cause a denial of service /tmp disk consumption and slave server crash via a zone transfer with unlimited data...

NSD (Name Server Daemon) < 4.1.11 AXFR Response DoS Vulnerability

NSD Name Server Daemon is prone to a denial of service DoS vulnerability. SPDX-FileCopyrightText: 2016 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only CPE =...

Name Server Daemon (NSD) Detection (DNS)

DNS TCP and UDP based detection of the Name Server Daemon NSD. SPDX-FileCopyrightText: 2009 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...