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CVE-2026-12244

8.7 high SSVC exploitation: none Analyzed
NVD · CVE.org

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

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.7 · nlnetlabsNVD modified 2026-10-25 23:10

Affected (CPE criteria) 1

  • cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:*

References 1