Amazon Linux 2 : curl (ALAS-2026-4099)

high Nessus Plugin ID 379828

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of curl installed on the remote host is prior to 8.3.0-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-4099 advisory.

When libcurl uses libssh2 with a hashed known_hosts file, an unrelated initial entry can cause host key validation to report a key mismatch as a missing key to the CURLOPT_SSH_KEYFUNCTION callback.
(CVE-2026-87865)

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 'yum update curl' or or 'yum update --advisory ALAS2-2026-4099' to update your system.

Plugin Details

Severity: High

ID: 379828

File Name: al2_ALAS-2026-4099.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 11/12/2026

Updated: 11/12/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.53

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-87865

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:curl-debuginfo, p-cpe:/a:amazon:linux:curl, p-cpe:/a:amazon:linux:libcurl-devel, p-cpe:/a:amazon:linux:libcurl

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/12/2026

Vulnerability Publication Date: 10/14/2026

Reference Information

CVE: CVE-2026-87865

IAVA: 2026-A-1143

Detections

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