CVE-2026-34502: Apache Portable Runtime Utility: Heap buffer overflow in APR memcached client

highCVSS 7.5CVE-2026-34502

CSIRTS triage

vendor: Apache product: Portable Runtime Utility Memory corruption

What: The APR Memcached client contains a heap buffer overflow vulnerability in command or response processing.
Who is affected: Applications using Apache APR Utility with Memcached backends.
Urgency: High severity (CVSS 7.5); heap overflow can enable remote code execution in Memcached client scenarios.
Action: Update Apache Portable Runtime Utility to a patched version that fixes heap buffer handling in the Memcached client.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Portable Runtime Utility

Get an email when a new Portable Runtime Utility advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.5
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34502

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-345020.53% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-34502	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Apache Portable Runtime Utility

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-32327: Apache Portable Runtime Utility: apr-util XML stack recursion crashmsrc · 2026-08-11
highCVE-2025-49506: Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attackmsrc · 2026-08-11
highCVE-2026-34501: Apache Portable Runtime Utility: Heap buffer overflow in APR redis clientmsrc · 2026-08-11
criticalCVE-2026-34191: Apache Portable Runtime Utility: SQL Injection in apr_dbd_oraclemsrc · 2026-08-11
highCVE-2026-34502: Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility memcached client T…nvd · 2026-08-06
highCVE-2026-34501: Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility redis client. This…nvd · 2026-08-06