Tuxera ntfs-3g 2021.8.22/2022.10.3/2026.2.25 NTFS Image libntfs-3g/index.c ntfs_ib_copy_tail heap-based overflow

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Tuxera ntfs-3g. The affected element is the function ntfs_ib_copy_tail of the file libntfs-3g/index.c of the component NTFS Image Handler. This manipulation causes heap-based overflow. This vulnerability appears as CVE-2026-46569. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Tuxera ntfs-3g and classified as very critical. Affected by this vulnerability is the function ntfs_ib_copy_tail of the file libntfs-3g/index.c of the component NTFS Image Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is 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(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs_ib_copy_tail(), 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 extending a directory, e.g., by creating a file.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-46569 since 05/15/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/07/2026).

Upgrading to version 2026.7.7 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-94354). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Tuxera

Name

• ntfs-3g

Version

• 2021.8.22
• 2022.10.3
• 2026.2.25

License

• open-source

Website

• Product: https://github.com/tuxera/ntfs-3g/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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