Amazon Linux 2 : squid, --advisory ALAS2-2026-3371 (ALAS-2026-3371)

critical Nessus Plugin ID 322007

Synopsis

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

Description

The version of squid installed on the remote host is prior to 3.5.20-17. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3371 advisory.

Due to an Improper Input Validation bug, Squid is vulnerable toa Heap-based Buffer Overflow attack against cache digests.

This problem allows a trusted server to perform a Heap-basedBuffer Overflow when sending maliciously crafted replies tocache_digest request messages.

This attack is limited to Squid instances that have beencompiled with the --enable-cache-digests option.
(CVE-2026-50012)

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 squid' or or 'yum update --advisory ALAS2-2026-3371' to update your system.

Plugin Details

Severity: Critical

ID: 322007

File Name: al2_ALAS-2026-3371.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 6/22/2026

Updated: 6/22/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-50012

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:squid-sysvinit, p-cpe:/a:amazon:linux:squid-migration-script, p-cpe:/a:amazon:linux:squid-debuginfo, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:squid

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/22/2026

Vulnerability Publication Date: 6/18/2026

Reference Information

CVE: CVE-2026-50012

IAVB: 2026-B-0165

Detections

Analytics