CVE-2026-46571: ntfs-3g Out-of-bounds Read — Fix

Description

In NTFS-3G before 2026.7.7, a out-of-bounds read exists in ntfs_fix_file_name() in libntfs-3g/reparse.c that allows an attacker to read possibly confidential information in ntfs-3g process memory by crafting a malicious NTFS image. The out-of-bounds read is triggered by a readlink on a corrupted file.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
tuxera	ntfs-3g	< 2026.7.7

References

Advisories & Patches

https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-52gr-j4pv-9pjh

Other References

https://github.com/tuxera/ntfs-3g/releases#release-2026.7.7

Frequently Asked Questions

What is CVE-2026-46571? +

In NTFS-3G before 2026.7.7, a out-of-bounds read exists in ntfs_fix_file_name() in libntfs-3g/reparse.c that allows an attacker to read possibly confidential information in ntfs-3g process memory by crafting a malicious NTFS image. The out-of-bounds read is triggered by a readlink on a corrupted file. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-46571? +

CVE-2026-46571 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-46571? +

CVE-2026-46571 affects products from tuxera, specifically: ntfs-3g. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-46571? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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