CVE-2026-108467: Microsoft PostScript Buffer Overflow

CVE-2026-108467 Overview

CVE-2026-108467 is a heap-based buffer overflow [CWE-122] in the Microsoft PostScript Printer Driver. The flaw allows an authorized attacker to execute code over a network against a vulnerable system. Microsoft published the advisory on October 13, 2026.

The vulnerability requires low privileges and no user interaction. Successful exploitation can compromise confidentiality, integrity, and availability of the target system. Microsoft documents the issue in the Microsoft CVE-2026-108467 Advisory.

Critical Impact
An authenticated attacker can trigger heap corruption in the PostScript Printer Driver remotely, leading to arbitrary code execution in the context of the driver process.

Affected Products

Microsoft PostScript Printer Driver (see Microsoft advisory for specific Windows versions)
Windows systems with the PostScript print driver component installed
Print servers exposing PostScript print services on the network

Discovery Timeline

2026-10-13 - CVE CVE-2026-108467 published to NVD
2026-10-13 - Last updated in NVD database

Technical Details for CVE-2026-108467

Vulnerability Analysis

The vulnerability is a heap-based buffer overflow in the Microsoft PostScript Printer Driver. The driver parses PostScript print job data and fails to correctly bound an allocation or copy operation on the heap. An attacker who can submit crafted print data to the driver can overwrite adjacent heap memory and corrupt control structures.

Because the attack vector is network-based and privileges required are low, an authenticated user on the network can reach the vulnerable print path. The scope remains unchanged, with high impact across confidentiality, integrity, and availability. Microsoft classifies this as code execution rather than information disclosure or denial of service.

Root Cause

The root cause is improper validation of input size or structure during PostScript data processing on the heap [CWE-122]. The driver trusts attacker-controlled length fields or object sizes when allocating or copying buffers. Microsoft has not publicly disclosed the specific function or structure involved.

Attack Vector

An authenticated attacker sends a crafted print job or PostScript stream to a system running the vulnerable driver. The malformed data triggers the heap overflow during parsing or rendering. The attacker gains code execution in the context of the print driver process, which typically runs with elevated privileges.

No verified public proof-of-concept is available. Describe the exploitation path through the Microsoft advisory rather than inferring internals.

Detection Methods for CVE-2026-108467

Indicators of Compromise

Unexpected crashes or restarts of print spooler processes such as spoolsv.exe or PrintIsolationHost.exe
Anomalous child processes spawned from print driver host processes
Inbound print traffic from unexpected internal hosts to print servers over SMB or IPP
Creation of unsigned binaries or scripts in print driver working directories

Detection Strategies

Monitor process lineage for the print spooler and driver isolation host for suspicious child process creation.
Correlate print job submission events with subsequent code execution or privilege escalation events on the same host.
Alert on crashes in print-related binaries that may indicate failed exploitation attempts.

Monitoring Recommendations

Enable Windows event logging for the Microsoft-Windows-PrintService/Operational channel and forward to a central SIEM.
Track network connections to print services (TCP 445, 631, 9100) and flag unusual sources.
Baseline normal PostScript print job sizes and flag outliers that may indicate crafted payloads.

How to Mitigate CVE-2026-108467

Immediate Actions Required

Apply the Microsoft security update referenced in the Microsoft CVE-2026-108467 Advisory to all affected systems.
Inventory hosts with the PostScript Printer Driver installed and prioritize servers exposing print services.
Restrict access to print services at the network layer until patching is complete.

Patch Information

Microsoft released a security update addressing CVE-2026-108467 on October 13, 2026. Administrators should consult the Microsoft CVE-2026-108467 Advisory for the specific KB articles and affected Windows builds.

Workarounds

Disable the PostScript Printer Driver on systems that do not require it.
Block inbound print protocols (SMB, IPP, LPD, RAW 9100) from untrusted network segments.
Enforce the principle of least privilege for accounts able to submit print jobs to shared print servers.
Where feasible, migrate to non-PostScript drivers or managed print services pending patch deployment.

bash

# Configuration example: disable Print Spooler on servers that do not host printers
Stop-Service -Name Spooler -Force
Set-Service -Name Spooler -StartupType Disabled