CVE-2026-108309 in Endpoint Configuration Toolset Solution
Summary
by MITRE • 10/27/2026
Tanium addressed an uncontrolled resource consumption vulnerability in Performance Client Extension.
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Analysis
by VulDB Data Team • 10/27/2026
The disclosed vulnerability represents a classic instance of uncontrolled resource consumption within the Tanium Performance Client Extension, a component responsible for collecting and reporting system performance metrics to the central management console. This flaw stems from insufficient validation or rate-limiting mechanisms when processing incoming requests or handling specific data streams associated with performance monitoring tasks. In operational environments where this extension is deployed across numerous endpoints, an attacker who can interact with the service interface may trigger conditions that cause the application to consume excessive CPU cycles, memory allocation, or file descriptors without bound. This lack of resource governance allows for a denial-of-service scenario where legitimate system operations are degraded or halted entirely due to resource exhaustion.
From a technical perspective, this vulnerability aligns closely with CWE-400, which describes conditions leading to uncontrolled consumption of resources within the same process. The root cause likely involves recursive loops, memory leaks triggered by specific malformed inputs, or inefficient handling of high-frequency polling requests that overwhelm internal buffers. When an adversary exploits this weakness, they do not necessarily need elevated privileges if the extension runs with sufficient access to system performance counters and network interfaces. By flooding the service with crafted packets or rapid-fire queries, the attacker can induce a state where the client agent becomes unresponsive, effectively breaking the visibility chain that Tanium provides for endpoint security monitoring.
The operational impact of this vulnerability is significant in enterprise environments relying on continuous telemetry for threat detection and incident response. A compromised Performance Client Extension renders the affected endpoints invisible to the central console regarding their performance status, creating a blind spot during critical investigation phases. Furthermore, if the resource exhaustion leads to a complete crash or restart of the Tanium agent service, it disrupts all other security functions managed by that agent, including file integrity monitoring and process execution logging. This disruption can be leveraged by threat actors to evade detection while they perform lateral movement or data exfiltration activities on the compromised host.
In terms of classification within industry frameworks, this vulnerability maps to MITRE ATT&CK technique T1499, Endpoint Denial of Service, specifically under sub-techniques involving resource exhaustion. It also relates to CWE-787, out-of-bounds write, if the memory corruption aspect is involved in causing the crash, though the primary vector described emphasizes consumption rather than arbitrary code execution. Security teams should prioritize patching this extension immediately upon vendor release of a fix that implements proper input validation and resource limits. Mitigation strategies also include network segmentation to restrict access to Tanium management ports from untrusted networks and monitoring for anomalous spikes in CPU or memory usage by the client process, which may indicate active exploitation attempts before patches are applied.