CVE-2026-70147 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 of systems relying on this component for document rendering and printing operations. This specific type of memory corruption occurs when an application writes more data to a block of dynamically allocated memory, known as the heap, than it is intended to hold. In the context of the Microsoft PostScript Printer Driver, this overflow can be triggered by processing maliciously crafted PostScript files or network print requests that contain oversized or malformed data structures. The driver fails to adequately validate input lengths before copying them into fixed-size buffers on the heap, leading to adjacent memory being overwritten with attacker-controlled data.
The operational impact of this vulnerability is severe due to its potential for remote code execution over a network without requiring user interaction in many scenarios. An unauthorized attacker can exploit this flaw by sending specially crafted print jobs or PostScript commands to a vulnerable system via the network stack. By carefully crafting the payload, an attacker can overwrite critical memory structures such as function pointers or exception handling records on the heap. When these overwritten values are subsequently dereferenced during normal driver operation, control flow is redirected to the malicious code injected by the attacker. This allows for full compromise of the affected system, enabling the execution of arbitrary commands with the privileges of the user account running the print spooler service or potentially higher depending on configuration and context.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) category CWE-122, which describes heap-based buffer overflows where memory corruption occurs in dynamically allocated regions rather than stack space. Heap overflows are particularly dangerous because they can be exploited to achieve arbitrary code execution more reliably than stack-based overflows due to the complex layout of heap metadata and the availability of sophisticated exploitation techniques like heap spraying or use-after-free primitives that may interact with this overflow. Furthermore, from a tactical perspective, this vulnerability maps to MITRE ATT&CK technique T1203, which covers Exploitation for Client Execution, as attackers often leverage trusted applications like printer drivers to execute malicious code on target systems while evading detection by appearing as legitimate system processes.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The primary defense is the application of vendor-supplied security patches that address the input validation logic within the PostScript Printer Driver, ensuring that all buffer sizes are strictly checked against allocated memory limits before data transfer occurs. Organizations should also consider disabling unnecessary print services or restricting network access to printing infrastructure through firewall rules and segmentation if remote printing is not a business requirement. Additionally, implementing application whitelisting policies can prevent unauthorized executables from running even if the initial exploit succeeds, thereby limiting the blast radius of any potential compromise. Regular auditing of installed printer drivers and removal of unused legacy components further reduces the attack surface available to adversaries seeking to leverage such memory corruption flaws for lateral movement or persistent access within enterprise environments.