ALAS2-2026-3892

Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-3892
Advisory Released Date: 2026-08-31
Advisory Updated Date: 2026-08-31
Severity: Important
Issue Overview:

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)


Affected Packages:

apr-util


Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.


Issue Correction:
Run yum update apr-util or yum update --advisory ALAS2-2026-3892 to update your system.

New Packages:
aarch64:
    apr-util-1.6.5-1.amzn2.0.1.aarch64
    apr-util-devel-1.6.5-1.amzn2.0.1.aarch64
    apr-util-pgsql-1.6.5-1.amzn2.0.1.aarch64
    apr-util-bdb-1.6.5-1.amzn2.0.1.aarch64
    apr-util-mysql-1.6.5-1.amzn2.0.1.aarch64
    apr-util-sqlite-1.6.5-1.amzn2.0.1.aarch64
    apr-util-odbc-1.6.5-1.amzn2.0.1.aarch64
    apr-util-ldap-1.6.5-1.amzn2.0.1.aarch64
    apr-util-openssl-1.6.5-1.amzn2.0.1.aarch64
    apr-util-nss-1.6.5-1.amzn2.0.1.aarch64
    apr-util-debuginfo-1.6.5-1.amzn2.0.1.aarch64

i686:
    apr-util-1.6.5-1.amzn2.0.1.i686
    apr-util-devel-1.6.5-1.amzn2.0.1.i686
    apr-util-pgsql-1.6.5-1.amzn2.0.1.i686
    apr-util-bdb-1.6.5-1.amzn2.0.1.i686
    apr-util-mysql-1.6.5-1.amzn2.0.1.i686
    apr-util-sqlite-1.6.5-1.amzn2.0.1.i686
    apr-util-odbc-1.6.5-1.amzn2.0.1.i686
    apr-util-ldap-1.6.5-1.amzn2.0.1.i686
    apr-util-openssl-1.6.5-1.amzn2.0.1.i686
    apr-util-nss-1.6.5-1.amzn2.0.1.i686
    apr-util-debuginfo-1.6.5-1.amzn2.0.1.i686

src:
    apr-util-1.6.5-1.amzn2.0.1.src

x86_64:
    apr-util-1.6.5-1.amzn2.0.1.x86_64
    apr-util-devel-1.6.5-1.amzn2.0.1.x86_64
    apr-util-pgsql-1.6.5-1.amzn2.0.1.x86_64
    apr-util-bdb-1.6.5-1.amzn2.0.1.x86_64
    apr-util-mysql-1.6.5-1.amzn2.0.1.x86_64
    apr-util-sqlite-1.6.5-1.amzn2.0.1.x86_64
    apr-util-odbc-1.6.5-1.amzn2.0.1.x86_64
    apr-util-ldap-1.6.5-1.amzn2.0.1.x86_64
    apr-util-openssl-1.6.5-1.amzn2.0.1.x86_64
    apr-util-nss-1.6.5-1.amzn2.0.1.x86_64
    apr-util-debuginfo-1.6.5-1.amzn2.0.1.x86_64

Additional References

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

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