CVE-2026-12244 — Heap overflow and crash with crafted SVCB RR
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 6…
Published: 2026-06-25 · CVSS: 8.7 · CVSS 4.0
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 that is used to allocate space needed for the RR wrap (because total size > 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7