CVE-2026-62772
Received Received - Intake

Heap-based Buffer Overflow in Windows Container Isolation FS Filter Driver

Publication date: 2026-08-11

Last updated on: 2026-08-11

Assigner: Microsoft Corporation

Description
Heap-based buffer overflow in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

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Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-62772
EUVD
EUVD-2026-56379

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_container_isolation_fs_filter_driver *-*

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

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Executive Summary

This is a heap-based buffer overflow vulnerability in the Windows Container Isolation FS Filter Driver (unionfs.sys). An authorized attacker can exploit it to elevate privileges locally by causing a buffer overflow in the driver.

Impact Analysis

An attacker with local access could exploit this to gain higher privileges on the system, potentially allowing them to take control of the affected machine or perform unauthorized actions.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the heap-based buffer overflow in the Windows Container Isolation FS Filter Driver (unionfs.sys).

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