CVE-2026-70110 in Windows
Summary
by MITRE • 10/14/2026
Stack-based buffer overflow in Microsoft PostScript Printer Driver allows an unauthorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified as a stack-based buffer overflow within the Microsoft PostScript Printer Driver represents a critical security flaw that compromises the integrity of local system access controls. This specific type of memory corruption occurs when data written to a fixed-size buffer on the call stack exceeds its allocated boundary, overwriting adjacent memory locations including return addresses and saved frame pointers. In the context of printer drivers, which operate with high privileges within the operating system kernel or user mode depending on the architecture, such an overflow provides a direct mechanism for attackers to manipulate program execution flow. The PostScript Printer Driver is frequently invoked during print jobs processed by local services, creating a plausible attack vector where maliciously crafted input can trigger this memory corruption without requiring prior authentication in certain configurations or through compromised applications that interact with printing subsystems.
From a technical perspective, the exploitation of this stack-based buffer overflow allows an unauthorized attacker to achieve arbitrary code execution on the target system. By carefully crafting the payload sent to the vulnerable driver component, an adversary can overwrite critical control data structures stored on the stack. This manipulation enables the injection and subsequent execution of shellcode or other malicious instructions within the context of the privileged process handling the print job. The operational impact is severe as it facilitates local privilege escalation, allowing a low-privileged user account to gain administrative rights or SYSTEM-level access. Once elevated privileges are obtained, the attacker can install programs, view, change, or delete critical data, and create new accounts with full permissions, effectively taking complete control of the affected system.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) category CWE-121, which describes stack-based buffer overflow conditions where a program writes more data to a buffer than it can hold on the call stack. Furthermore, in terms of tactical behavior within cyber kill chains, this exploitation technique corresponds to MITRE ATT&CK techniques related to privilege escalation and local code execution, specifically leveraging memory corruption vulnerabilities to bypass standard security boundaries. The attack vector is typically classified as Local (L), meaning physical or logical access to the machine is required initially, but the resulting impact significantly expands the attacker's capabilities from a limited user context to full system control.
Mitigation strategies for this vulnerability primarily involve applying vendor-supplied patches that address the memory handling logic within the PostScript Printer Driver. Organizations should prioritize updating all affected systems with the latest security updates released by Microsoft to close the gap in buffer boundary checks. Additionally, implementing strict application whitelisting and restricting print spooler services can reduce the attack surface. Security teams should also monitor for anomalous process creation events originating from printer-related processes, as these may indicate active exploitation attempts. Regular vulnerability assessments and penetration testing focused on peripheral driver interactions are recommended to ensure that similar memory safety issues do not persist in other components of the printing infrastructure.