Description

Heap-based buffer overflow in Windows Shell allows an unauthorized attacker to execute code over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-09-08T18:19:54.707Z",
  "pubdate": "2026-09-08T18:19:54.707Z",
  "executiveSummary": "This vulnerability is identified as a heap-based buffer overflow within the Windows Shell component. The flaw allows a remote, unauthorized attacker to achieve arbitrary code execution on a target system by sending specifically crafted network-based requests.\nThe vulnerability resides in how the Windows Shell processes malformed data, leading to memory corruption during heap management. Because the shell is a core component of the Windows operating system, successful exploitation results in complete compromise of the host, granting the attacker the same privilege level as the user session or the underlying process.\nThe risk is critical due to the remote exploitability via network protocols, which does not necessitate local access or complex user interaction to trigger the overflow. The exploitability of heap-based memory corruption typically involves bypassing security features such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP).\nAffected systems include various versions of the Windows platform that utilize the vulnerable Windows Shell component. Organizations are advised to prioritize the identification of exposed services utilizing this component and monitor for anomalous network traffic indicative of heap manipulation or shellcode execution.",
  "technicalDetails": "The vulnerability is rooted in a heap-based buffer overflow condition within the Windows Shell. This occurs when the application fails to perform adequate bounds checking while copying or parsing data into a pre-allocated buffer residing on the process heap. By providing an input that exceeds the allocated memory size, an attacker can overwrite adjacent heap chunks.\nThe exploitation flow begins with the delivery of a malicious payload over a network protocol handled by the Windows Shell. The payload is designed to trigger an error in the memory management logic, specifically targeting heap allocation routines. By corrupting the heap metadata, an attacker can manipulate heap pointers or object references, effectively transforming a memory corruption event into a primitive for arbitrary memory read/write or control flow hijacking.\nAttackers typically target specific heap structures to hijack execution paths. For example, by overwriting virtual function pointers or sensitive object headers, the attacker redirects the instruction pointer (EIP/RIP) to execute shellcode contained within the payload or to trigger Return-Oriented Programming (ROP) chains to bypass DEP/NX protections. ASLR bypasses may be achieved by leveraging side-channel information leaks or memory grooming techniques to predict the base addresses of system modules.\nThe vulnerable component is the Windows Shell, which performs extensive data parsing to support UI operations and shell integration. Because this component often runs with significant privileges, the successful execution of payload code leads to full system compromise. The attack requires no authentication, allowing any remote actor with network visibility to the vulnerable port or service to initiate the exploitation sequence.\nPost-exploitation, the attacker gains the ability to execute arbitrary commands, install persistence mechanisms, exfiltrate sensitive data, or pivot through the local network. The lack of strict input validation at the entry points of the shell functions allows the attacker to craft highly reliable exploits that maintain system stability during the overflow process, thereby minimizing the chance of service disruption that might alert defenders."
}