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[USN-8719-1] APR-util vulnerabilities

Posted on 03 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8719-1
September 03, 2026

apr-util vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in APR-util.

Software Description:
- apr-util: Apache Portable Runtime Utility Library

Details:

It was discovered that APR-util incorrectly performed password hash
comparisons in a way that was not constant-time.
An attacker could possibly use this issue to obtain sensitive information.
(CVE-2025-49506)

It was discovered that APR-util incorrectly handled recursive XML element
quoting. An attacker could possibly use this issue to cause applications
using APR-util to crash, resulting in a denial of service.
(CVE-2026-32327)

It was discovered that the APR-util Redis client incorrectly handled
certain network data, resulting in a heap-based buffer overflow. A remote
attacker could possibly use this issue to cause APR-util applications to
crash or execute arbitrary code. This issue only affected Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.
(CVE-2026-34501)

It was discovered that the APR-util memcached client incorrectly handled
certain network data, resulting in a heap-based buffer overflow. A remote
attacker could possibly use this issue to cause APR-util applications to
crash or execute arbitrary code. (CVE-2026-34502)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libaprutil1t64 1.6.3-3ubuntu3.1

Ubuntu 24.04 LTS
libaprutil1t64 1.6.3-1.1ubuntu7.1

Ubuntu 22.04 LTS
libaprutil1 1.6.1-5ubuntu4.22.04.3

Ubuntu 20.04 LTS
libaprutil1 1.6.1-4ubuntu2.2+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libaprutil1 1.6.1-2ubuntu0.1+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libaprutil1 1.5.4-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 14.04 LTS
libaprutil1 1.5.3-1ubuntu0.1~esm3
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8719-1
CVE-2025-49506, CVE-2026-32327, CVE-2026-34501, CVE-2026-34502

Package Information:
https://launchpad.net/ubuntu/+source/apr-util/1.6.3-3ubuntu3.1
https://launchpad.net/ubuntu/+source/apr-util/1.6.3-1.1ubuntu7.1
https://launchpad.net/ubuntu/+source/apr-util/1.6.1-5ubuntu4.22.04.3

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