Detections
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Amazon Linux 2023 : nginx, nginx-all-modules, nginx-core (ALAS2023-2026-2130)

high Nessus Plugin ID 344474

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-2130 advisory.

 An HTTP/2 denial of service vulnerability was found in nginx. Prior to the fix, there was no limit on the number of request headers a client could send. An attacker could seed the HPACK dynamic table with a header, then emit thousands of indexed references that each cost significant server allocation. Combined with HTTP/2 zero-byte flow-control window stalling, all allocations are pinned indefinitely, allowing a single client to exhaust server memory.

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 nginx --releasever 2023.12.20260909' or or 'dnf update --advisory ALAS2023-2026-2130 --releasever 2023.12.20260909' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-2130.html

https://alas.aws.amazon.com/faqs.html

Plugin Details

Severity: High

ID: 344474

File Name: al2023_ALAS2023-2026-2130.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/10/2026

Updated: 9/10/2026

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:nginx-all-modules, p-cpe:/a:amazon:linux:nginx-core-debuginfo, p-cpe:/a:amazon:linux:nginx-core, p-cpe:/a:amazon:linux:nginx-debuginfo, p-cpe:/a:amazon:linux:nginx-debugsource, p-cpe:/a:amazon:linux:nginx-filesystem, p-cpe:/a:amazon:linux:nginx-mod-devel, p-cpe:/a:amazon:linux:nginx-mod-http-image-filter-debuginfo, p-cpe:/a:amazon:linux:nginx-mod-http-image-filter, p-cpe:/a:amazon:linux:nginx-mod-http-perl-debuginfo, p-cpe:/a:amazon:linux:nginx-mod-http-perl, p-cpe:/a:amazon:linux:nginx-mod-http-xslt-filter-debuginfo, p-cpe:/a:amazon:linux:nginx-mod-http-xslt-filter, p-cpe:/a:amazon:linux:nginx-mod-mail-debuginfo, p-cpe:/a:amazon:linux:nginx-mod-mail, p-cpe:/a:amazon:linux:nginx-mod-stream-debuginfo, p-cpe:/a:amazon:linux:nginx-mod-stream, p-cpe:/a:amazon:linux:nginx

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 9/10/2026

Vulnerability Publication Date: 9/10/2026