CVE-2026-12244
Fixed in a distro release EPSS <1%CVSS 8.7
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
Products: NLnet Labs NSD
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.24 | nsd | 4.14.3-r0 |
| Debian 14 | nsd | 4.14.3-1 |
| Ubuntu 25.10 | nsd | no fix |
| Ubuntu 26.10 | nsd | no fix |
| Ubuntu Pro 16.04 LTS | nsd | 4.1.7-1ubuntu0.1~esm1 |
| Ubuntu Pro 18.04 LTS | nsd | 4.1.17-1ubuntu0.1~esm1 |
| Ubuntu Pro 20.04 LTS | nsd | 4.1.26-1ubuntu0.1~esm1 |
| Ubuntu Pro 22.04 LTS | nsd | 4.3.9-1ubuntu0.1~esm1 |
| Ubuntu Pro 24.04 LTS | nsd | 4.8.0-1ubuntu0.1~esm1 |
| Ubuntu Pro 26.04 LTS | nsd | 4.14.0-1ubuntu0.1~esm1 |
| openSUSE Leap 16.0 | nsd | 4.14.3-bp160.1.1 |
| openSUSE Tumbleweed | nsd | 4.14.3-1.1 |