CVE-2026-46570
Received Received - Intake

Heap Buffer Overflow in NTFS-3G

Publication date: 2026-10-07

Last updated on: 2026-10-07

Assigner: MITRE

Description
In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs_index_walk_down() in libntfs-3g/index.c that allows an attacker to corrupt heap memory in the SUID-root ntfs-3g binary by crafting a malicious NTFS image. The overflow is triggered by reading the special crafted file metadata.

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Meta Information

Published
2026-10-07
Last Modified
2026-10-07
Generated
2026-10-07
AI Q&A
2026-10-07
EPSS Evaluated
N/A
NVD
CVE-2026-46570
EUVD
EUVD-2026-94377

Affected Vendors & Products

Showing 1 associated CPE
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n/a n/a n/a

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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

CVE-2026-46570 is a heap buffer overflow vulnerability in NTFS-3G before version 2026.7.7. It occurs in the ntfs_index_walk_down() function when processing malicious NTFS file metadata. The flaw allows heap memory corruption in the SUID-root ntfs-3g binary, potentially enabling arbitrary code execution with elevated privileges.

Detection Guidance

This vulnerability can be detected by checking the installed version of NTFS-3G. Run 'ntfs-3g --version' to verify if your version is 2026.2.25 or earlier. If so, the system is vulnerable. Additionally, monitor for suspicious activity related to NTFS image processing or heap corruption errors in system logs.

Impact Analysis

An attacker could exploit this to corrupt memory in the ntfs-3g binary, leading to arbitrary code execution with root privileges. This requires local access but no prior privileges or user interaction. Successful exploitation could allow full system compromise, data theft, or denial of service.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements in GDPR and HIPAA. Organizations using vulnerable NTFS-3G versions may face compliance violations, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Immediately update NTFS-3G to version 2026.7.7 or later. Since no workarounds exist, patching is the only mitigation. Avoid mounting untrusted NTFS images until the update is applied. Restrict access to the ntfs-3g binary to reduce attack surface.

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