Microsoft PostScript Driver Buffer Overflow Enables Remote Code Execution
A critical heap-based buffer overflow in the Microsoft PostScript Printer Driver allows attackers to execute code over a network.
Key points
- CVE-2026-70153 is rated Critical with a CVSS score of 9.8 by NVD.
- The vulnerability stems from a heap-based buffer overflow in the driver.
- Microsoft classifies the issue as a Remote Code Execution flaw.
Microsoft has disclosed a critical vulnerability in its PostScript Printer Driver that allows remote code execution. The flaw, identified as CVE-2026-70153, enables an unauthorised attacker to execute arbitrary code over a network. This exposure affects systems relying on the affected driver for print processing. Security teams should assess their exposure immediately, as the issue involves remote network access. The potential for remote exploitation makes this a high-priority concern for infrastructure teams managing print services or shared resources.
Root cause
The underlying issue is a heap-based buffer overflow within the Microsoft PostScript Printer Driver. This type of error occurs when data exceeds the boundaries of allocated memory, potentially allowing an attacker to overwrite adjacent memory structures. The National Vulnerability Database categorises this weakness under CWE-122. Microsoft’s security advisory confirms that this specific memory management failure is the vector for the remote code execution capability. Understanding this root cause helps defenders anticipate how similar drivers might be vulnerable to memory corruption attacks.
Attack path
An unauthorised attacker can exploit this flaw over a network. The source material indicates that the vulnerability allows code execution via network access. This suggests the attack path involves sending malicious data to a service using the driver. Because the exploit works remotely, attackers can target exposed print services or networked computers from outside the local segment. This remote capability significantly increases the risk profile for organisations with publicly accessible print infrastructure.
Affected versions
Microsoft has identified the Microsoft PostScript Printer Driver as the affected component. The advisory does not list specific version numbers or operating system builds in the provided summary. Teams must consult the full Microsoft Security Update Guide to determine which specific patches address this issue. Until then, assume any system running the Microsoft PostScript Printer Driver is potentially vulnerable. Verification requires cross-referencing internal asset inventories with vendor-specific patch notes.
Mitigation
- Review the Microsoft Security Update Guide for the latest patching guidance.
- Restrict network access to services using the PostScript Printer Driver.
- Monitor for unauthorised code execution attempts on affected systems.
- Validate that all print services are running the latest vendor-approved updates.
Signals worth monitoring
Security operations teams should watch for anomalous outbound connections from print servers or workstations. Look for unexpected process creations that do not align with normal printing workflows. Memory corruption often leads to crashes or hangs, so monitor for unusual driver failures. Check for suspicious network traffic originating from devices that should only handle print jobs. Incident response teams usually isolate affected hosts immediately upon detecting these behaviours. Containment involves stopping the printing services to prevent further exploitation while investigating the scope of the compromise.
What to do and how to stay safe: Microsoft
- Check your asset inventory for systems running the Microsoft PostScript Printer Driver.
- Apply the latest security updates once the vendor provides an update for CVE-2026-70153.
- Restrict network access to print services to reduce exposure to remote attackers.
- Monitor logs for signs of unauthorised code execution or memory corruption errors.
Step-by-step guide: Out-of-band patches: what small businesses need to know
General security guidance from the Firewall Pulse newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is the CVSS score for CVE-2026-70153?
The National Vulnerability Database rates the vulnerability as Critical with a CVSS score of 9.8.
Does this vulnerability require user interaction?
The source material states that an unauthorised attacker can execute code over a network but does not specify user interaction requirements.
What type of vulnerability is this?
It is a heap-based buffer overflow in the Microsoft PostScript Printer Driver leading to remote code execution.
