CVE-2026-61811 Wazuh: Unbounded Recursion in os_xml `_getattributes()` Causes analysisd Worker Thread Stack Exhaustion
An attacker can cause a denial of service in Wazuh analysisd by sending crafted XML with excessive attributes, exhausting stack memory.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-61811?
CVE-2026-61811 is a medium-severity denial of service vulnerability in wazuh, published on 24 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-674
Which versions are affected by CVE-2026-61811?
How do I fix CVE-2026-61811?
No fix has been published for CVE-2026-61811 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-61811 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61811 exists.
Sources
Also known as GHSA-9wv5-7qwx-m9w5.