CVE-2026-62772

Analyzed Analyzed - Analysis Complete

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

Publication date: 2026-08-11

Last updated on: 2026-08-13

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-13

Generated

2026-09-01

AI Q&A

2026-08-11

EPSS Evaluated

2026-08-30

NVD

CVE-2026-62772

EUVD

EUVD-2026-56379

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)

Helpful Resources

Exploitability

CWE

KEV

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().

Attack-Flow Graph

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.

Detection Guidance

This vulnerability involves a heap-based buffer overflow in the Windows Container Isolation FS Filter Driver (unionfs.sys). Detection typically requires analyzing system logs for unusual activity in the driver or container isolation components. Microsoft may provide detection guidance in security updates or advisories. Check the Microsoft Update Guide for CVE-2026-62772 for official detection methods.

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.

Compliance Impact

The vulnerability allows local privilege escalation in Windows Container Isolation FS Filter Driver, which could enable unauthorized access to sensitive data or system functions. This may violate compliance requirements for data protection standards like GDPR or HIPAA if exploited to access protected health or personal information.

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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