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Apache APR-util EUVDEUVD-2026-53917

| CVE-2026-34501 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-08-06 apache GHSA-m335-2qh4-r66x
7.5
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
7.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Network-reachable via rogue Redis server, no auth or complexity required; impact is availability-only heap crash with no confidentiality or integrity effect.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Red Hat
7.5 MEDIUM
qualitative

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Updated
Aug 06, 2026 - 22:41 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 06, 2026 - 22:22 vuln.today
cvss_changed
Severity Changed
Aug 06, 2026 - 22:22 NVD
MEDIUM HIGH
CVSS changed
Aug 06, 2026 - 22:22 NVD
7.5 (MEDIUM) 7.5 (HIGH)
Analysis Generated
Aug 06, 2026 - 16:15 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Heap-based buffer overflow in Apache Portable Runtime Utility's redis client component allows remote unauthenticated attackers to crash applications that use the library, resulting in a denial of service. Affected versions span APR-util 1.6.0 through 1.6.3; version 1.6.4 resolves the issue per Apache's advisory on the oss-security mailing list. No public exploit code and no CISA KEV listing have been identified at time of analysis, though SSVC classifies the flaw as automatable with partial technical impact, indicating it could be scripted for broad scanning.

Technical ContextAI

Apache Portable Runtime Utility (APR-util) is a companion library to the Apache Portable Runtime (APR), providing cross-platform abstractions used extensively by Apache httpd, Subversion, and other Apache ecosystem projects. In APR-util 1.6.x, a redis client module was introduced to allow applications to interact with Redis key-value stores. CWE-122 (Heap-based Buffer Overflow) identifies the root cause: the redis client fails to adequately validate or bound-check data received from the remote redis peer before writing into a heap-allocated buffer, allowing an oversized or malformed response/payload to overwrite adjacent heap memory. The CPE string cpe:2.3:a:apache_software_foundation:apache_portable_runtime_utility:*:*:*:*:*:*:*:* covers the affected 1.6.0-1.6.3 range. Because APR-util is a library rather than a standalone service, the vulnerability surfaces only in applications that link against it and invoke the redis client interface.

RemediationAI

The primary remediation is to upgrade Apache Portable Runtime Utility to version 1.6.4, which contains the vendor-confirmed fix as announced at https://lists.apache.org/thread/o8h6c7cq86fplxlnry6c3rn9x0ovq8mv. Downstream consumers of APR-util, including distributions packaging Apache httpd or Subversion, should update their bundled APR-util packages once vendor builds incorporating 1.6.4 are available. If an immediate upgrade is not feasible, the most effective compensating control is to disable or refrain from using the APR-util redis client API in application code, effectively preventing the vulnerable code path from being reached - this has no side effects if Redis integration is not operationally required. Additionally, restricting network-level access between application hosts and Redis endpoints using firewall rules or network segmentation reduces exposure by ensuring that only trusted Redis servers can send responses to APR-util clients, eliminating the attacker-controlled-server attack vector. Note that these controls mitigate but do not eliminate risk, and upgrade to 1.6.4 remains the definitive fix.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected

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EUVD-2026-53917 vulnerability details – vuln.today

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