# CVE-2026-40706

> Vulnerability · severity: **HIGH** (CVSS 8.4).

## Description

In NTFS-3G 2022.10.3 before 2026.2.25, a heap buffer overflow exists in ntfs_build_permissions_posix() in acls.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 on the READ path (stat, readdir, open) when processing a security descriptor with multiple ACCESS_DENIED ACEs containing WRITE_OWNER from distinct group SIDs.

## Key facts

- **CVE ID:** CVE-2026-40706
- **Published:** 2026-04-21
- **CVSS severity:** HIGH
- **CVSS base score:** 8.4
- **CWE codes:** CWE-122

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40706

## Citation

> AI Analytics. CVE-2026-40706. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-40706. Derived from NIST NVD. Licensed CC0.

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