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Amazon Linux 2 : php, --advisory ALAS2-2026-3316 (ALAS-2026-3316)

critical Nessus Plugin ID 317027

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Synopsis

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

Description

The version of php installed on the remote host is prior to 5.4.16-46. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3316 advisory.

 In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the SOAP extension's object deduplication mechanism stores pointers to PHP objects in a global map without incrementing their reference counts. When an apache:Map node contains duplicate keys, processing the second entry overwrites the first in the temporary result map, freeing the original PHP object while its stale pointer remains in the map. A subsequent href reference to the freed node can copy the dangling pointer into the result. As PHP string allocations can reclaim the freed memory region, an attacker with control over the SOAP request body can exploit this use-after-free to achieve remote code execution.
 (CVE-2026-6722)

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 php' or or 'yum update --advisory ALAS2-2026-3316' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2026-3316.html

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

https://explore.alas.aws.amazon.com/CVE-2026-6722.html

Plugin Details

Severity: Critical

ID: 317027

File Name: al2_ALAS-2026-3316.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/27/2026

Updated: 5/27/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-6722

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.5

Threat Score: 8.4

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:php-snmp, p-cpe:/a:amazon:linux:php-embedded, p-cpe:/a:amazon:linux:php-xmlrpc, p-cpe:/a:amazon:linux:php-pspell, p-cpe:/a:amazon:linux:php-recode, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:php-ldap, p-cpe:/a:amazon:linux:php-mysqlnd, p-cpe:/a:amazon:linux:php-debuginfo, p-cpe:/a:amazon:linux:php-xml, p-cpe:/a:amazon:linux:php-cli, p-cpe:/a:amazon:linux:php-odbc, p-cpe:/a:amazon:linux:php-enchant, p-cpe:/a:amazon:linux:php-gd, p-cpe:/a:amazon:linux:php-bcmath, p-cpe:/a:amazon:linux:php-fpm, p-cpe:/a:amazon:linux:php-pgsql, p-cpe:/a:amazon:linux:php-devel, p-cpe:/a:amazon:linux:php-process, p-cpe:/a:amazon:linux:php-mbstring, p-cpe:/a:amazon:linux:php-dba, p-cpe:/a:amazon:linux:php-common, p-cpe:/a:amazon:linux:php, p-cpe:/a:amazon:linux:php-soap, p-cpe:/a:amazon:linux:php-intl, p-cpe:/a:amazon:linux:php-pdo

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/26/2026

Vulnerability Publication Date: 5/6/2026

Reference Information

CVE: CVE-2026-6722

IAVA: 2026-A-0440