High [CVE-2026-12246] Out of bounds stack write with crafted APL RR
This high-severity Red Hat Linux advisory covers CVE-2026-12246.
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Summary
NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes. A flaw was found in NSD.
A remote attacker, operating as a configured primary DNS server in a multi-tenant secondary DNS deployment, could exploit a bug involving specially crafted Address Prefix List (APL) resource records. This could lead to arbitrary code execution or a denial of service.
This is an Important flaw in NSD, affecting multi-tenant secondary DNS deployments. The vulnerability requires the attacker to be a trusted primary, but the risk is significant in multi-tenant environments.
This vulnerability doesn't affect any supported Red Hat Product. Red Hat severity: Important — CVSS 8 (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H).
Weakness: CWE-787.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 21 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 21 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 21 days ago·verify at source
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