CVE-2026-61811
Received Received - Intake

Stack Overflow in Wazuh Analysisd via XML Attributes

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: GitHub, Inc.

Description
Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. From 3.8.0 until 4.14.7, the _getattributes() function in src/os_xml/os_xml.c recursively processes every XML attribute without a depth limit while allocating two large local buffers in each stack frame. An enrolled agent can submit a Windows EventChannel event containing an element with enough attributes to exhaust the analysisd worker-thread stack, trigger a segmentation fault, and interrupt log ingestion. The element-depth limit in _ReadElem() does not constrain the number of attributes on one element, so it does not prevent this condition. This issue is fixed in version 4.14.7.

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-24
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-61811
EUVD
EUVD-2026-86331

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wazuh wazuh From 3.8.0 (inc) to 4.14.7 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-674 The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

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Executive Summary

This vulnerability is a stack exhaustion issue in Wazuh versions 3.8.0 to 4.14.7. The _getattributes() function in src/os_xml/os_xml.c processes XML attributes recursively without a depth limit while allocating large local buffers. An attacker can exploit this by sending a Windows EventChannel event with an element containing excessive attributes, causing the analysisd worker thread to crash due to stack overflow.

Detection Guidance

This vulnerability can be detected by checking the Wazuh version installed on your system. If your version is between 3.8.0 and 4.14.7, it is vulnerable. Run the command 'wazuh-control -V' or check the Wazuh manager logs for version information.

Impact Analysis

If exploited, this vulnerability can interrupt log ingestion in Wazuh by crashing the analysisd worker thread. This may lead to loss of security monitoring capabilities, reduced visibility into system events, and potential gaps in threat detection for affected environments.

Mitigation Strategies

Upgrade Wazuh to version 4.14.7 or later immediately. This version includes the fix for the stack exhaustion vulnerability. Follow the official Wazuh upgrade guide for your deployment type to ensure a smooth transition.

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