High severity8.8NVD Advisory· Published Jun 25, 2026· Updated Jun 26, 2026
CVE-2026-12244
CVE-2026-12244
Description
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
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Affected products
3- osv-coords2 versions
< 4.14.3-bp160.1.1+ 1 more
- (no CPE)range: < 4.14.3-bp160.1.1
- (no CPE)range: < 4.14.3-1.1
Patches
Vulnerability mechanics
References
1- www.nlnetlabs.nl/downloads/nsd/CVE-2026-12244.txtnvdPatchVendor Advisory
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