CVE-2026-108467 in Windows
Summary
by MITRE • 10/14/2026
Heap-based buffer overflow in Microsoft PostScript Printer Driver allows an authorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described involves a heap-based buffer overflow within the Microsoft PostScript Printer Driver, a component responsible for processing print jobs submitted by client systems to printers utilizing PostScript language capabilities. This specific flaw arises from improper validation of user-supplied input during the parsing and rendering of PostScript data streams. When an attacker crafts a maliciously formatted PostScript file or network packet containing oversized or malformed commands, the driver fails to correctly check buffer boundaries before copying this data into memory allocated on the heap. Consequently, excess data overwrites adjacent memory locations, corrupting the heap structure and potentially allowing for arbitrary code execution if the overwritten control flow data is carefully manipulated by the attacker.
From a technical perspective, this vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-122: Heap-based Buffer Overflow. The core issue lies in the lack of rigorous bounds checking when handling variable-length inputs within the printer driver's processing pipeline. In many cases, such vulnerabilities are exploited by overwriting function pointers or exception handler structures located on the heap, which can redirect program execution to attacker-controlled shellcode. This type of memory corruption is particularly dangerous because it does not require local access; instead, it leverages the network-facing nature of print services and driver interactions. The attack vector typically involves sending a specially crafted document over a network connection where the vulnerable printer driver processes the data without sufficient sanitization or length verification.
The operational impact of this vulnerability is severe, as successful exploitation allows an authenticated attacker to execute arbitrary code on the target system with the privileges of the user account running the print spooler service. In many enterprise environments, these services run under high-privilege accounts such as SYSTEM or local administrators, thereby granting the attacker full control over the compromised machine. This can lead to complete system compromise, including data exfiltration, lateral movement within the network, and installation of persistent backdoors. Furthermore, because print drivers are often loaded into memory by multiple processes, exploitation might be facilitated through various entry points where PostScript content is rendered or processed, increasing the attack surface significantly across Windows-based systems that rely on this driver infrastructure.
Mitigation strategies for this vulnerability primarily involve applying vendor-provided security patches and updates released by Microsoft to address the buffer overflow condition in the affected printer drivers. Organizations should ensure that all workstations and servers connected to network printers are fully patched with the latest cumulative updates. Additionally, implementing strict access controls on print services can limit exposure; disabling unnecessary print spooler functionality or restricting who can submit PostScript jobs reduces the likelihood of exploitation. Network segmentation is also recommended to isolate printing infrastructure from general corporate networks, thereby limiting an attacker's ability to reach vulnerable systems remotely. Monitoring for anomalous network traffic patterns associated with large or malformed PostScript data transfers can aid in early detection and response efforts aligned with MITRE ATT&CK techniques related to remote code execution via printer drivers.