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Amazon Linux 2 : apr-util, --advisory ALAS2-2026-3892 (ALAS-2026-3892)

critical Nessus Plugin ID 341903

Synopsis

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

Description

The version of apr-util installed on the remote host is prior to 1.6.5-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3892 advisory.

 APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards to hashes or passwords comparisons, potentially leaking their content via a side channel timing attack particularly on platforms without crypt() such as Windows, BeOS, NetWare, or Android.

 Users are recommended to upgrade to version 1.6.4, which fixes this issue. (CVE-2025-49506)

 A bug in APR-util version 1.6.3 (and earlier) allows a stack recursion attack against any library consumer which parses XML from untrusted sources and uses the apr_xml_quote_elem() function.

 Users are recommended to upgrade to version 1.6.4, which fixes this issue. (CVE-2026-32327)

 Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility redis client.

 This issue affects Apache Portable Runtime Utility: from 1.6.0 through 1.6.3.

 Users are recommended to upgrade to version 1.6.4, which fixes the issue. (CVE-2026-34501)

 Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility memcached client

 This issue affects Apache Portable Runtime Utility: from 1.3.0 through 1.6.3. (CVE-2026-34502)

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 'yum update apr-util' or or 'yum update --advisory ALAS2-2026-3892' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2026-3892.html

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

https://explore.alas.aws.amazon.com/CVE-2025-49506.html

https://explore.alas.aws.amazon.com/CVE-2026-32327.html

https://explore.alas.aws.amazon.com/CVE-2026-34501.html

https://explore.alas.aws.amazon.com/CVE-2026-34502.html

Plugin Details

Severity: Critical

ID: 341903

File Name: al2_ALAS-2026-3892.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/31/2026

Updated: 8/31/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.62

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-32327

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: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:apr-util-bdb, p-cpe:/a:amazon:linux:apr-util-debuginfo, p-cpe:/a:amazon:linux:apr-util-devel, p-cpe:/a:amazon:linux:apr-util-ldap, p-cpe:/a:amazon:linux:apr-util-mysql, p-cpe:/a:amazon:linux:apr-util-nss, p-cpe:/a:amazon:linux:apr-util-odbc, p-cpe:/a:amazon:linux:apr-util-openssl, p-cpe:/a:amazon:linux:apr-util-pgsql, p-cpe:/a:amazon:linux:apr-util-sqlite, p-cpe:/a:amazon:linux:apr-util

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/31/2026

Vulnerability Publication Date: 8/6/2026

Reference Information

CVE: CVE-2025-49506, CVE-2026-32327, CVE-2026-34501, CVE-2026-34502