CVE-2026-12244 Affecting nsd package, versions <4.14.3-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ALPINE324-NSD-17481564
- published25 Jun 2026
- disclosed25 Jun 2026
Introduced: 25 Jun 2026
CVE-2026-12244 (opens in a new tab)How to fix?
Upgrade Alpine:3.24 nsd to version 4.14.3-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream nsd package and not the nsd package as distributed by Alpine.
See How to fix? for Alpine:3.24 relevant fixed versions and status.
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