External risk intelligence

Microsoft PostScript Printer Driver Heap Overflow Network Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-70153

The vulnerability affects a printer driver. While printer drivers can be exposed to network traffic in some environments, they are typically found on internal print servers or local workstations rather than being directly exposed to the public internet. Public-facing internet exposure for this type of component is uncommon.

Buffer Overflow

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory details a critical vulnerability in Microsoft's PostScript Printer Driver that could allow an unauthorized individual to run malicious code over a network. While the potential for code execution is significant, the primary concern at this stage is determining if our environment utilizes this specific printer driver and if it is exposed in a manner that aligns with the threat.

Code execution flaw in a Microsoft printer driver.
Critical severity, remote execution potential.
Confirm relevance and exposure in our environment.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted data over a network to the Microsoft PostScript Printer Driver. This could allow them to execute arbitrary code, potentially leading to a complete compromise of the affected system.

Entry Condition: Network access required.
Trigger Point: Sending malformed data to the printer driver.
Resulting Risk: Remote code execution and system compromise.

Live Threat

Current exploitation, exposure, and threat context

A heap-based buffer overflow in the Microsoft PostScript Printer Driver could allow an unauthenticated attacker to execute arbitrary code over a network. This could occur when the driver processes specially crafted PostScript data, potentially leading to system compromise.

Remote code execution.
Processing malicious PostScript data.
System compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Microsoft PostScript Printer Driver requires immediate attention from teams responsible for endpoint security, print infrastructure, and potentially application owners if the driver is embedded within a broader solution. The first practical step is to inventory all systems running the affected driver, assess external network exposure and business criticality, and identify the specific system or application owners. This information will inform a prioritized remediation plan, potentially involving vendor coordination or temporary risk reduction measures.

Ownership: Endpoint security and infrastructure teams.
Verify first: System inventory and network exposure.
Action: Plan coordinated remediation.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the Microsoft PostScript Printer Driver?

This component is a core part of the Windows operating system that translates print jobs into the PostScript language, which printers use to understand how to render text and images on a page. It acts as a specialized translator between your computer’s software applications and the physical printing hardware connected to your network or workstation.

What does CVE-2026-70153 mean for the driver?

It describes a heap-based buffer overflow (CWE-122). In plain terms, this means the printer driver fails to properly manage the memory it uses when processing data. If an attacker sends a malformed or oversized packet of information, it can overflow the allocated memory area and potentially allow unauthorized code to run on the system.

How is the vulnerability triggered?

The flaw is triggered when the driver receives and processes specially crafted PostScript data over a network. It does not occur during standard, routine printing tasks using valid documents. Successful exploitation requires an attacker to transmit malicious data packets directly to the component while it is listening for or receiving print-related traffic.

Is my system at risk according to Halo Surface Signal?

Halo Surface Signal notes that this vulnerability is unlikely to be exposed on the public internet. Because printer drivers typically operate on internal print servers or local, private workstations rather than internet-facing endpoints, they generally lack the direct external network path required for an attacker to reach the driver remotely.

What should I do if I use this printer driver?

Begin by identifying which systems in your environment have this specific printer driver installed. Once you have a clear inventory, assess how these systems are connected to your network to confirm they are not unintentionally accessible from outside your private perimeter. Use this information to coordinate with your infrastructure team to prepare for upcoming vendor updates.

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70153

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.