CVE-2026-34501 Apache Portable Runtime Utility: Heap buffer overflow in APR redis client

What is CVE-2026-34501?

CVE-2026-34501 is a high-severity memory corruption vulnerability in Apache Portable Runtime Utility, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-122

Which versions are affected by CVE-2026-34501?

1 open source package ship an affected version, including apr-util. It affects 1 product.

Products include Apache Apr-Util.

How do I fix CVE-2026-34501?

Upgrade apr-util to 1.6.4 or later.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-34501 being exploited?

There is no known exploitation of CVE-2026-34501 in the wild and no public exploit code.

Other vulnerabilities in Apache Portable Runtime Utility

• CVE-2009-2412 Integer overflow in n/a Critical 10.0
• CVE-2026-32327 Apache Portable Runtime Utility: apr-util XML stack recursion crash Critical 9.1
• CVE-2026-34191 Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle Critical 9.1
• CVE-2025-49506 Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack High 7.5
• CVE-2026-34502 Apache Portable Runtime Utility: Heap buffer overflow in APR memcached client High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-34501, AZL-94634, BELL-CVE-2026-34501, BIT-apr-util-2026-34501, DEBIAN-CVE-2026-34501, ECHO-84fd-85d1-59f4 and 2 more.