Amazon Linux 2023 : squid (ALAS2023-2026-1858)

medium Nessus Plugin ID 322071

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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 ALAS2023-2026-1858 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 'dnf update squid --releasever 2023.12.20260622' or or 'dnf update --advisory ALAS2023-2026-1858 --releasever 2023.12.20260622' to update your system.

Plugin Details

Severity: Medium

ID: 322071

File Name: al2023_ALAS2023-2026-1858.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 6/22/2026

Updated: 7/23/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 51.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-50012

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:squid-debuginfo, p-cpe:/a:amazon:linux:squid-debugsource, 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

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