Microsoft PostScript Printer Driver Flaw Rated Critical for Remote Code Execution

Microsoft has identified a critical remote code execution vulnerability in its PostScript Printer Driver, designated as CVE-2026-70147. According to the official Microsoft Security Update Guide, this flaw allows an unauthorized attacker to execute code over a network by exploiting a heap-based buffer overflow within the driver software.

The National Vulnerability Database assigns this issue a CVSS score of 9.8, classifying it as Critical. The vulnerability is categorized under CWE-122, indicating a standard heap-based buffer overflow weakness. Both sources agree on the core mechanism and the potential for network-based exploitation by an unauthorized attacker.

Context and Background

The Microsoft Security Update Guide describes the technical nature of the flaw as a heap-based buffer overflow. This type of vulnerability occurs when a program writes data beyond the allocated memory space in the heap. The advisory explicitly states that the driver allows an unauthorized attacker to execute code over a network.

The National Vulnerability Database record mirrors the Microsoft description, confirming that the heap-based buffer overflow in the Microsoft PostScript Printer Driver enables remote code execution. The source material does not specify the exact conditions required for exploitation beyond the network access and the presence of the vulnerable driver.

Who Is Affected

Systems utilizing the Microsoft PostScript Printer Driver are affected by this vulnerability. The Microsoft advisory does not specify particular operating system versions or driver builds in the provided summary, but the presence of the driver implies exposure. Any environment where this driver is installed and accessible over a network could potentially be targeted.

Organizations relying on Microsoft printing infrastructure should assume their systems are at risk. The critical rating suggests that the flaw is severe enough to warrant attention from security teams responsible for managing print services and driver updates on Windows-based endpoints and servers.

What should you do?

Security professionals should monitor official Microsoft channels for detailed patch information and specific version impacts. Since the source material does not confirm the availability of a fix, organizations should focus on limiting network exposure to print services. Isolating print servers and restricting access to the PostScript Printer Driver ports can reduce the attack surface while awaiting a vendor update.

What to do and how to stay safe: Microsoft

• Restrict network access to print services to trusted internal segments only.
• Monitor network traffic for unusual connections targeting print server ports.
• Disable unused printer drivers or services on critical systems if possible.
• Await official vendor updates before attempting unverified workarounds.

Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger

General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

What is the CVSS score for CVE-2026-70147?

The National Vulnerability Database rates CVE-2026-70147 with a CVSS score of 9.8, which is classified as Critical.

What type of vulnerability is CVE-2026-70147?

It is a heap-based buffer overflow in the Microsoft PostScript Printer Driver that allows remote code execution.

Can this vulnerability be exploited remotely?

Yes, the Microsoft advisory states that an unauthorized attacker can execute code over a network via this flaw.