This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-12244 →

DEBIAN-CVE-2026-12244

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...

Original description

The description as published by the source.

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

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:14 nsd

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.3-1"}]}]

References

advisory security-tracker.debian.org