DSA-6437-1 apr-util - security update
Several vulnerabilities were discovered in apr-util, the Apache Portable Runtime Utility library, which could result in denial of service or potentially the execution of arbitrary code. https://security-tracker.debian.org/tracker/DSA-6437-1
CSIRTS triage
- What
- Multiple vulnerabilities in Apache Portable Runtime Utility library that could result in denial of service or arbitrary code execution.
- Who is affected
- Systems using affected apr-util library versions in Apache or other applications.
- Urgency
- High; arbitrary code execution possible in apr-util; patches available.
- Action
- Apply DSA-6437-1 update to apr-util.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://lists.debian.org/debian-security-announce/2026/msg00348.html
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-2025-495060.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-323270.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-345010.53% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all EPSS-scored CVEs.
- 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-2025-49506 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-32327 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34501 | coverage & exploitation status | NVD · CVE.org |
| 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.
- high[NEW] [high] Apache Portable Runtime (APR): Multiple vulnerabilitiescert-bund
- highCVE-2026-34502: Apache Portable Runtime Utility: Heap buffer overflow in APR memcached clientmsrc
- highCVE-2025-49506: Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attackmsrc
- highCVE-2026-34501: Apache Portable Runtime Utility: Heap buffer overflow in APR redis clientmsrc
- mediumCVE-2026-32327: Apache Portable Runtime Utility: apr-util XML stack recursion crashmsrc
- highCVE-2026-34502: Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility memcached client T…nvd
- highCVE-2026-34501: Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility redis client. This…nvd
- criticalCVE-2026-32327: A bug in APR-util version 1.6.3 (and earlier) allows a stack recursion attack against any libr…nvd
- highCVE-2025-49506: APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time w…nvd
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