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Amazon Linux 2023 : curl, curl-minimal, libcurl (ALAS2023-2026-3404)

critical Nessus Plugin ID 377943

Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3404 advisory.

 A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process. (CVE-2026-18924)

 A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection. (CVE-2026-19931)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'dnf update curl --releasever 2023.12.20261109' or or 'dnf update --advisory ALAS2023-2026-3404 --releasever 2023.12.20261109' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-3404.html

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

https://explore.alas.aws.amazon.com/CVE-2026-18924.html

https://explore.alas.aws.amazon.com/CVE-2026-19931.html

Plugin Details

Severity: Critical

ID: 377943

File Name: al2023_ALAS2023-2026-3404.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 11/9/2026

Updated: 11/9/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.61

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-19931

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:curl-debuginfo, p-cpe:/a:amazon:linux:curl-debugsource, p-cpe:/a:amazon:linux:curl-minimal-debuginfo, p-cpe:/a:amazon:linux:curl-minimal, p-cpe:/a:amazon:linux:curl, p-cpe:/a:amazon:linux:libcurl-debuginfo, p-cpe:/a:amazon:linux:libcurl-devel, p-cpe:/a:amazon:linux:libcurl-minimal-debuginfo, p-cpe:/a:amazon:linux:libcurl-minimal, p-cpe:/a:amazon:linux:libcurl

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/9/2026

Vulnerability Publication Date: 9/3/2026

Reference Information

CVE: CVE-2026-18924, CVE-2026-19931

IAVA: 2026-A-0932-S