Detections
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Amazon Linux 2023 : python3-unbound, unbound, unbound-anchor (ALAS2023-2026-3222)
high Nessus Plugin ID 369106
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Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-3222 advisory.Amazon Linuxvended DNS resolvers shipped with an older DNSSEC root signing key. For hosts configured with DNSSEC validation enabled, this could result in DNS resolution failures, including for names in unsigned zones. This applies where the resolver is still using the trust anchor shipped in the package;
resolvers that already picked up the new root key via RFC 5011 are unaffected.
On 11 October 2026 at 14:00 UTC the DNS root zone began signing with KSK-2024 (key tag 38696), replacing KSK-2017 (key tag 20326). The packaged trust anchor files contained only KSK-2017, so an affected resolver cannot validate the root DNSKEY RRset and returns SERVFAIL.
The updated packages include an updated root signing key.
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Run 'dnf update unbound --releasever 2023.12.20261013' or or 'dnf update --advisory ALAS2023-2026-3222 --releasever 2023.12.20261013' to update your system.See Also
Plugin Details
Severity: High
ID: 369106
File Name: al2023_ALAS2023-2026-3222.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 10/21/2026
Updated: 10/21/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Vulnerability Information
CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:python3-unbound-debuginfo, p-cpe:/a:amazon:linux:python3-unbound, p-cpe:/a:amazon:linux:unbound-anchor-debuginfo, p-cpe:/a:amazon:linux:unbound-anchor, p-cpe:/a:amazon:linux:unbound-debuginfo, p-cpe:/a:amazon:linux:unbound-debugsource, p-cpe:/a:amazon:linux:unbound-devel, p-cpe:/a:amazon:linux:unbound-libs-debuginfo, p-cpe:/a:amazon:linux:unbound-libs, p-cpe:/a:amazon:linux:unbound-utils-debuginfo, p-cpe:/a:amazon:linux:unbound-utils, p-cpe:/a:amazon:linux:unbound
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 10/14/2026
Vulnerability Publication Date: 10/14/2026