Description

Heap-based buffer overflow in Windows Message Queuing allows an authorized attacker to elevate privileges locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-11T17:18:58.870Z",
  "pubdate": "2026-08-11T17:18:58.870Z",
  "executiveSummary": "A heap-based buffer overflow vulnerability exists within the Windows Message Queuing component, affecting Microsoft Windows operating systems. The vulnerability allows an authenticated local attacker to achieve privilege escalation by executing arbitrary code in the context of a privileged user or system account. The core flaw resides in improper memory management operations when processing message data within the queuing subsystem, leading to memory corruption. Exploitation requires the attacker to have local access and authorization to interact with the Windows Message Queuing service. Successful exploitation compromises the confidentiality, integrity, and availability of the affected host, potentially allowing the adversary to bypass security controls and assume full control of the underlying operating system. Organizations utilizing the affected Windows Message Queuing feature face significant risk if local environment security boundaries are breached, as unprivileged users could leverage this flaw to escalate privileges. Remediation relies on applying vendor-supplied security updates designated for the affected component.",
  "technicalDetails": "The vulnerability is characterized as a heap-based buffer overflow stemming from inadequate bounds checking during the parsing and processing of internal data structures within the Windows Message Queuing service. When specific message payloads or control requests are supplied to the vulnerable component, memory allocated on the heap is improperly sized or managed, allowing input data to overwrite adjacent heap memory chunks. The vulnerable component is responsible for handling message serialization, queue management, and inter-process communication routines inherent to the Windows Message Queuing architecture. An authorized local attacker interacts with the queuing subsystem, supplying a maliciously crafted input sequence designed to exceed the allocated buffer boundaries on the heap. As the vulnerable functions process the oversized data without validating length constraints, heap corruption occurs, corrupting adjacent metadata or function pointers. Subsequent execution flow manipulation allows the injected payload to execute with the elevated privileges associated with the service process context. The attack vector requires local execution and authorization to communicate with the queuing service, meaning remote network exploitation is generally not applicable unless combined with a separate remote access vector. Post-exploitation impact includes full local privilege escalation, enabling the adversary to install persistent backdoors, access sensitive system resources, tamper with security monitoring tools, or pivot to other systems within the local network perimeter. The technical root cause centers on unsafe memory handling patterns where input lengths are not strictly validated against destination heap buffer allocations."
}