nsd: If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS me...
CVE-2026-12244 is fixed in nsd on 1 platform, first by nsd 4.14.0-1ubuntu0.1~esm1, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.
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
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nsd · Debian 14 | 4.14.3-1 | DEBIAN-CVE-2026-12244 | Jun 28, 2026 |
| nsd · Ubuntu 26.04.1 LTS (resolute) | 4.14.0-1ubuntu0.1~esm1 | nsd 4.14.0-1ubuntu0.1~esm1 | Jun 24, 2026 |
| nsd · opensuse-leap 16.0 | 4.14.3-bp160.1.1 | OPENSUSE-SU-2026:21502-1 | Jul 29, 2026 |
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