HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-12244 — If NSD is configured as secondary for a zone, the primary of that zone can crash...

·Source: NIST NVD

Updated:

Executive Summary

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 6550

Analysis

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 Score: 8.8. Published: 2026-06-25T07:16:44.900.

Indicators of Compromise (1)

CVE (1)
CVE-2026-12244
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Jun 25, 2026. Verified by: NIST.

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