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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-06 · updated 2026-10-24
Weakness: CWE-122

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.

Affected products

Apache Apr-Util: from 1.6.0 before 1.6.4 — fixed in 1.6.4

How to fix

Upgrade to a fixed version: Apache Apr-Util 1.6.4. Check the vendor advisory for mitigations.

References

https://lists.apache.org/thread/o8h6c7cq86fplxlnry6c3rn9x0ovq8mv
http://www.openwall.com/lists/oss-security/2026/08/06/11

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