CVE-2026-70153 – Microsoft PostScript Printer Driver Remote Code Execution Vulnerability

CVE-2026-70153 is a critical Remote Code Execution (RCE) vulnerability affecting the Microsoft PostScript Printer Driver. The vulnerability is caused by a heap-based buffer overflow that allows an unauthenticated attacker to execute malicious code remotely by sending a specially crafted network packet to an affected service. With a CVSS score of 9.8, this vulnerability presents a significant security risk because exploitation requires no authentication, no user interaction, and relatively little technical complexity. The vulnerability affects multiple versions of Windows 10, Windows 11, Windows Server, and Microsoft Visual Studio 2026. Successful exploitation could compromise system confidentiality, integrity, and availability.

CVSS SCORE: 9.8

SEVERITY: Critical

Threat

This vulnerability presents a serious threat because attackers could remotely execute malicious code on affected systems without requiring valid credentials or any action from users.

The attack can be launched over a network and has low attack complexity, making vulnerable systems potentially attractive targets.

Successful exploitation could allow attackers to compromise sensitive information, modify system data, disrupt critical services, or execute additional malicious activities.

The vulnerability carries a high impact rating across confidentiality, integrity, and availability, indicating the potential for severe consequences if successfully exploited.

Exploits

Microsoft has classified this vulnerability as Exploitation Less Likely.

At the time of publication, the vulnerability had not been publicly disclosed, and there were no reported instances of active exploitation.

The exploit code maturity is classified as Unproven, meaning the existence of functional public exploit code or proof-of-concept (PoC) exploitation has not been confirmed.

There is also no confirmed evidence of this vulnerability being exploited as a zero-day.

However, the vulnerability’s low attack complexity, network accessibility, and lack of authentication requirements make it a significant security concern.

Technical Summary

CVE-2026-70153 is a heap-based buffer overflow vulnerability (CWE-122) within the Microsoft PostScript Printer Driver.

A heap-based buffer overflow occurs when a program writes more data into a dynamically allocated memory buffer than the buffer can safely accommodate. This can corrupt adjacent memory and potentially allow an attacker to influence program execution.

In this case, an unauthenticated attacker could exploit the vulnerability by sending a specially crafted network packet to an affected service.

When the vulnerable component processes the malicious packet, the buffer overflow could be triggered, potentially allowing the attacker to execute arbitrary code on the targeted system.

Several technical characteristics increase the severity of this vulnerability:

• Network-based attack: Attackers can attempt exploitation remotely through an accessible network service.
• Low attack complexity: Exploitation does not require complex conditions.
• No authentication required: Attackers do not need valid user accounts or credentials.
• No user interaction required: Victims do not need to open files, click links, or perform other actions.
• High security impact: Successful exploitation could compromise confidentiality, integrity, and availability.

The vulnerability has an unchanged scope, meaning the security impact remains within the affected security authority.

Microsoft has released an official security fix to address this vulnerability.

Exploitability

The vulnerability affects the following Microsoft products:

• Windows 10: Versions 1607, 1809, 21H2, and 22H2.
• Windows 11: Versions 23H2, 24H2, 25H2, and 26H1.
• Windows Server: 2012, 2012 R2, 2016, 2019, 2022, and 2025, including Server Core installations.
• Microsoft Visual Studio: 2026 version 18.10.

Affected architectures include 32-bit, x64, and ARM64, depending on the Windows version.

An attacker could exploit the vulnerability by sending a specially crafted network packet to an affected service, potentially achieving remote code execution without authentication or user interaction.

Although exploitation is considered less likely, the technical conditions required for an attack are relatively simple.

Business Impact

CVE-2026-70153 poses a significant business risk because successful exploitation could allow unauthorized attackers to execute malicious code on vulnerable Windows systems.

The vulnerability affects both workstation and server operating systems, potentially exposing business-critical infrastructure.

Organizations could face several consequences:

• Unauthorized system access: Attackers could execute malicious code on compromised systems without requiring legitimate credentials.
• Sensitive data exposure: Confidential business information, customer records, and other sensitive data could be accessed or stolen.
• Operational disruption: Successful attacks could interfere with critical applications, services, and business operations.
• System integrity compromise: Attackers could manipulate or corrupt important system files and business data.
• Financial and reputational damage: Security incidents could result in recovery expenses, operational downtime, and loss of customer confidence.

The widespread range of affected Windows versions increases the potential organizational exposure, particularly in environments operating multiple generations of Windows servers and workstations.

“When attackers can execute code without a password or a single user click, one vulnerable system can become a serious business security incident.”

Workaround

Microsoft has not identified any official workarounds or mitigations for this vulnerability.

Organizations unable to deploy the security update immediately should consider temporary risk-reduction measures:

• Restrict unnecessary network access to affected systems.
• Limit exposure of vulnerable services to untrusted networks.
• Monitor affected systems for suspicious network traffic and unexpected processes.
• Prioritize patching systems that are accessible from less-trusted networks.

These measures may reduce exposure but do not eliminate the underlying vulnerability.

Urgency

Immediate patch deployment is strongly recommended due to the Critical severity and CVSS score of 9.8.

Although Microsoft has assessed exploitation as less likely and no active exploitation has been reported, the vulnerability presents a serious security risk because attackers could execute malicious code remotely without authentication or user interaction.

The combination of network-based exploitation, low attack complexity, and potentially severe system compromise makes this vulnerability particularly concerning for organizations operating affected Windows systems.

Microsoft has released security updates to address the vulnerability, including:

• KB5127648: Windows 11 versions 24H2 and 25H2, and Microsoft Visual Studio 2026 version 18.10.
• KB5127646: Windows 11 version 26H1.
• KB5126653: Windows 11 version 23H2.
• KB5126657: Windows 10 versions 21H2 and 22H2.
• KB5126651: Windows 10 version 1809 and Windows Server 2019.
• KB5126868: Windows 10 version 1607 and Windows Server 2016.
• KB5126835: Windows Server 2012.
• KB5126836: Windows Server 2012 R2.
• KB5126655: Windows Server 2022.
• KB5126646: Windows Server 2025.

A system restart is required after installing the applicable security update.

No known issues are identified for the listed updates.

Organizations should prioritize internet-facing and business-critical systems, deploy the appropriate security updates, and verify successful installation.

“With a critical 9.8 severity score and no authentication barrier, delaying this patch leaves an unnecessary opening for a potentially devastating cyberattack.”