CVE-2026-42837

Analyzed Analyzed - Analysis Complete

Buffer Over-Read in Windows Projected File System Filter Driver

Publication date: 2026-06-09

Last updated on: 2026-06-11

Assigner: Microsoft Corporation

Description

Buffer over-read in Windows Projected File System Filter Driver allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-06-09

Last Modified

2026-06-11

Generated

2026-06-30

AI Q&A

2026-06-09

EPSS Evaluated

2026-06-28

NVD

CVE-2026-42837

EUVD

EUVD-2026-35591

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_10_1809	to 10.0.17763.8880 (exc)
microsoft	windows_10_1809	to 10.0.17763.8880 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7417 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7417 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7417 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7417 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7417 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7417 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7219 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7219 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8655 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8655 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8655 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8655 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2269 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2269 (exc)
microsoft	windows_server_2019	to 10.0.17763.8880 (exc)
microsoft	windows_server_2022	to 10.0.20348.5256 (exc)
microsoft	windows_server_2025	to 10.0.26100.32995 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is a buffer over-read in the Windows Projected File System Filter Driver. It allows an authorized attacker to read beyond the intended buffer boundaries, which can lead to unexpected behavior.

Exploiting this vulnerability enables the attacker to elevate their privileges locally on the affected system.

Impact Analysis

The vulnerability can impact you by allowing an authorized attacker to elevate their privileges on your system. This means the attacker could gain higher-level access than originally permitted, potentially leading to unauthorized actions, data compromise, or system control.

Compliance Impact

The provided information does not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

Mitigation Strategies

This vulnerability allows an authorized attacker to elevate privileges locally by exploiting a buffer over-read in the Windows Projected File System Filter Driver.

To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft as soon as they become available.

Additionally, limiting local user privileges and monitoring for unusual privilege escalation attempts can help reduce risk until patches are applied.

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