CVE-2026-70153 in Windows
Summary
by MITRE • 10/14/2026
Heap-based buffer overflow in Microsoft PostScript Printer Driver allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified as a heap-based buffer overflow within the Microsoft PostScript Printer Driver represents a critical security flaw that compromises the integrity and availability of systems relying on this component for document rendering. This specific type of memory corruption occurs when the driver fails to properly validate the length or bounds of user-supplied input before copying it into a pre-allocated block of heap memory. In the context of printer drivers, which often process complex data streams from networked print queues, an attacker can craft a malicious PostScript file containing specially constructed commands that exceed the expected buffer limits. When the driver processes this malformed data, it writes beyond the allocated boundaries, overwriting adjacent memory structures such as function pointers or object headers on the heap. This corruption alters the control flow of the application, allowing the attacker to redirect execution to arbitrary code injected into the process space.
The operational impact of this vulnerability is severe due to its potential for remote code execution without user interaction in certain deployment scenarios. Because printer drivers often run with elevated privileges or within a service context that has access to sensitive system resources, successful exploitation can grant an unauthorized attacker full control over the affected machine. This enables the installation of malware, theft of confidential data stored on the local system, and further lateral movement across the network if the compromised host is used as a pivot point. The risk is particularly acute in enterprise environments where print servers are central to operations and frequently exposed to internal or external networks that allow submission of print jobs.
From a classification perspective, this flaw aligns with CWE-122, which denotes heap-based buffer overflow, indicating the specific mechanism by which memory safety violations lead to exploitation. Furthermore, the attack vector corresponds to MITRE ATT&CK technique T1059, specifically command and script interpretation via printer drivers or related system components, as well as potential alignment with initial access vectors if exploited through network services like SMB printing protocols. The vulnerability underscores the risks associated with legacy driver architectures that may not adhere strictly to modern memory safety standards such as those promoted by CWE-617 regarding improper enforcement of semantic intent in buffer handling operations.
Mitigation strategies must prioritize immediate patching and configuration hardening. Organizations should apply the latest security updates provided by Microsoft for all affected versions of Windows operating systems, ensuring that the PostScript Printer Driver is updated to a version where input validation checks have been strengthened or replaced with safer memory management practices. In environments where printing services are not strictly required, disabling the Print Spooler service and removing unnecessary printer drivers can significantly reduce the attack surface. Additionally, implementing network segmentation to restrict access to print servers and enforcing strict authentication policies for print queue submissions can prevent unauthorized users from submitting malicious PostScript files. Regular auditing of installed software components and monitoring for anomalous memory usage patterns in spooler processes can also aid in early detection of exploitation attempts.