What is CVE-2026-34501?

CVE-2026-34501 is a high-severity vulnerability in Apache Apr-Util, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-08-06.

How severe is CVE-2026-34501?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Apache Apr-Util

CVE-2026-34501

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.

Vulnerability class: Buffer Overflow

EPSS: 0.005 (42.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Apache Apr-util
Apache Software Foundation Portable Runtime Utility — versions 1.6.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-34501?: CVE-2026-34501 is a high-severity vulnerability in Apache Apr-Util, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-08-06.
How severe is CVE-2026-34501?: High severity. CVSS v3 base score is 7.5 out of 10.