VDB
CVE-2026-12244
CVE-2026-12244
PUBLISHED
CVSS 8.7 HIGH
Reported by NLnet Labs · Published June 25, 2026
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
Risk Scores
CVSS 4.0
8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| NLnet Labs | NSD | 4.14.0 |
| NLnet Labs | NSD | 4.14.0 |
| alpine | nsd | 0, 0, 0 |
Timeline
- Jun 25, 2026 CVE Published
- Jun 25, 2026 CVE Updated
- Jun 26, 2026 EPSS Score
- Jun 26, 2026 Coalition ESS Score
- Jun 29, 2026 Security Advisory
- Aug 7, 2026 EPSS Score
- Aug 24, 2026 EPSS Score
- Aug 27, 2026 EPSS Score
- Sep 1, 2026 EPSS Score
- Sep 6, 2026 EPSS Score