CVE-2026-24282: Push Message Routing Service Vulnerability

CVE-2026-24282 Overview

CVE-2026-24282 is an out-of-bounds read vulnerability in the Microsoft Push Message Routing Service. This memory disclosure flaw allows an authorized attacker with local access to read beyond intended memory boundaries, potentially exposing sensitive information stored in system memory.

Critical Impact

An authenticated local attacker can exploit this vulnerability to access sensitive information that should be protected, potentially including credentials, encryption keys, or other confidential data processed by the Push Message Routing Service.

Affected Products

• Microsoft Windows Push Message Routing Service
• Windows operating systems with Push Notification services enabled

Discovery Timeline

• 2026-03-10 - CVE-2026-24282 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2026-24282

Vulnerability Analysis

This vulnerability is classified as CWE-125: Out-of-bounds Read. The Push Message Routing Service fails to properly validate buffer boundaries when processing certain operations, allowing an attacker to read data from memory locations outside the intended buffer space.

Out-of-bounds read vulnerabilities occur when software reads data past the end, or before the beginning, of the intended buffer. In the context of the Push Message Routing Service, this can result in the disclosure of sensitive information that resides in adjacent memory regions.

The local attack vector requires the attacker to have authenticated access to the target system. Once authenticated, no user interaction is required to exploit this vulnerability. The confidentiality impact is high, meaning sensitive data can be fully compromised, though the vulnerability does not allow modification of data or system disruption.

Root Cause

The root cause of CVE-2026-24282 stems from insufficient bounds checking within the Push Message Routing Service. When processing push message data, the service reads beyond allocated buffer boundaries due to improper validation of input length or offset values. This allows memory contents adjacent to the legitimate buffer to be exposed to the attacker.

Attack Vector

The attack requires local access to the affected system with valid credentials. An attacker with standard user privileges can craft specific requests to the Push Message Routing Service that trigger the out-of-bounds read condition. The service then returns data from memory regions beyond the intended buffer, potentially including:

• Process memory containing sensitive runtime data
• Cached credentials or authentication tokens
• Encryption keys or cryptographic material
• Internal system state information

The attack does not require elevated privileges beyond standard authentication, making it accessible to any local user on an affected system.

Detection Methods for CVE-2026-24282

Indicators of Compromise

• Unusual memory access patterns from the Push Message Routing Service process
• Unexpected read operations targeting the Push Notification Windows Service
• Anomalous inter-process communication requests to the Push Message Routing Service

Detection Strategies

• Monitor the Push Message Routing Service for abnormal behavior using endpoint detection and response (EDR) solutions
• Enable detailed Windows Event logging for service-related activities
• Implement application whitelisting to detect unauthorized interactions with system services
• Deploy SentinelOne Singularity platform for real-time behavioral analysis of service exploitation attempts

Monitoring Recommendations

• Configure audit policies to log access to the Push Message Routing Service
• Establish baseline behavior for the service and alert on deviations
• Monitor for privilege escalation attempts following information disclosure
• Review authentication logs for suspicious local access patterns

How to Mitigate CVE-2026-24282

Immediate Actions Required

• Apply the latest Microsoft security updates as soon as they become available
• Restrict local access to systems running the Push Message Routing Service to authorized personnel only
• Review and limit user accounts with local login privileges
• Enable enhanced monitoring on affected systems until patches are deployed

Patch Information

Microsoft has released security guidance for this vulnerability. Administrators should consult the Microsoft CVE-2026-24282 Update Guide for official patch information and deployment instructions. Apply all available security updates through Windows Update or WSUS as part of your regular patch management cycle.

Workarounds

• Limit local user access to affected systems through access control policies
• Disable the Push Message Routing Service if not required for business operations
• Implement network segmentation to reduce exposure of affected systems
• Use application control policies to restrict interactions with the vulnerable service

# Check Push Notification service status
Get-Service -Name WpnService

# Disable service if not required (run as Administrator)
Stop-Service -Name WpnService
Set-Service -Name WpnService -StartupType Disabled