---
id: CVE-2026-42617
title: >-
  In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs_ir_to_ib()
  in index.c that allows an attacker to corrupt heap memory in the SUID-root
  ntfs-3g binary by crafting a malicious NTFS image
summary: >-
  In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs_ir_to_ib()
  in 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 exten…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-122
vendor: tuxera
product: ntfs-3g
affected:
  - ntfs-3g < 2026.7.7
patched:
  - ntfs-3g 2026.7.7
published: '2026-10-07'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T19:09:12.637'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42617'
references:
  - url: 'https://github.com/tuxera/ntfs-3g/releases#release-2026.7.7'
    label: cve@mitre.org
  - url: 'https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-jv65-qqf7-f692'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00147
epssPercentile: 0.03859
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-07T20:23:43.929847Z'
ingestedAt: '2026-10-07T14:33:21.953Z'
---

## Overview

In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs_ir_to_ib() in 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.

## Affected

- `ntfs-3g < 2026.7.7`

## Remediation

Upgrade past the affected range:

- `ntfs-3g 2026.7.7`