CVE-2026-12244
CVE-2026-12244 · Heap overflow and crash with crafted SVCB RR
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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
CVSS 8.7 · High · EPSS 0.5% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
nsd
- Versions
- ≥ 4.14.0, < 4.14.3: Affected (semver)
Update to 4.14.3
nsd Debian:14
- Versions
- 4.12.0-1
- 4.12.0-2
- 4.13.0-1
- 4.13.0-2
- 4.13.0-3
- 4.13.0-4
- 4.13.0-5
- 4.13.0-6
- 4.14.0-1
- 4.14.1-1
- 4.14.2-1
- Affected ranges
- ECOSYSTEM: < 4.14.3-1
Update to 4.14.3-1
nsd Ubuntu:25.10
- Versions
- 4.11.1-1
- 4.12.0-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd Ubuntu:26.10
- Versions
- 4.14.0-1
- 4.14.2-1
- 4.14.3-1
- 4.15.0-1
- 4.15.0-1build1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd Ubuntu:Pro:26.04:LTS
- Versions
- 4.12.0-1
- 4.13.0-6
- 4.14.0-1
- Affected ranges
- ECOSYSTEM: < 4.14.0-1ubuntu0.1~esm1
Update to 4.14.0-1ubuntu0.1~esm1