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 closin…
CVSS 4.0HIGH 8.7·Network·No auth·No interaction·EPSS 0.0046·Published 2026-06-25·Fixed in 4.14.3CWE-416
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 (uint16_t) variable tha…
CVSS 4.0HIGH 8.7·Network·Low privileges·No interaction·EPSS 0.00487·Published 2026-06-25·Fixed in 4.14.3CWE-122
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.
The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept ope…
CVSS 4.0HIGH 8.2·Network·No auth·No interaction·EPSS 0.0044·Published 2026-08-26·Fixed in 4.15.1CWE-290
Any remote client can crash a (debugging/non-release build type) NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options (17 when UDP payload size is 512).
CVSS 4.0HIGH 8.2·Network·No auth·No interaction·EPSS 0.0046·Published 2026-08-26·Fixed in 4.15.1CWE-400
query.c in NSD 3.0.x through 3.0.8, 3.1.x through 3.1.1, and 3.2.x before 3.2.12 allows remote attackers to cause a denial of service (NULL pointer dereference and child process crash) via a crafted DNS packet.
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 attack…
CVSS 4.0HIGH 7.2·Network·Low privileges·No interaction·EPSS 0.00444·Published 2026-06-25·Fixed in 4.14.3CWE-120
Off-by-one error in the packet_read_query_section function in packet.c in nsd 3.2.1, and process_query_section in query.c in nsd 2.3.7, allows remote attackers to cause a denial of service (crash) and possibly execute ar…