Tuxera ntfs-3g up to 2026.2.25 libntfs-3g/security.c build_inherited_id buffer overflow

Summaryinfo

A vulnerability categorized as very critical has been discovered in Tuxera ntfs-3g up to 2026.2.25. Affected is the function build_inherited_id of the file libntfs-3g/security.c. Executing a manipulation can lead to buffer overflow. This vulnerability is tracked as CVE-2026-56135. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability classified as very critical was found in Tuxera ntfs-3g up to 2026.2.25. This vulnerability affects the function build_inherited_id of the file libntfs-3g/security.c. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In NTFS-3G through 2026.2.25, a heap-based buffer overflow exists in the function build_inherited_id() in libntfs-3g/security.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 creating a file in a crafted directory.

The advisory is available at github.com. This vulnerability was named CVE-2026-56135 since 06/19/2026. The exploitation appears to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/24/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Tuxera

Name

• ntfs-3g

Version

• 2026.2.0
• 2026.2.1
• 2026.2.2
• 2026.2.3
• 2026.2.4
• 2026.2.5
• 2026.2.6
• 2026.2.7
• 2026.2.8
• 2026.2.9
• 2026.2.10
• 2026.2.11
• 2026.2.12
• 2026.2.13
• 2026.2.14
• 2026.2.15
• 2026.2.16
• 2026.2.17
• 2026.2.18
• 2026.2.19
• 2026.2.20
• 2026.2.21
• 2026.2.22
• 2026.2.23
• 2026.2.24
• 2026.2.25

License

• open-source

Website

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

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