CVE-2026-40706
High
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.
SeverityHigh
CVSS8.4
Exploit probability—
ProductNTFS-3G
PublishedApr 21, 2026
First seenApr 21, 2026
Weakness typeCWE-122CWE-122
How to fix
Update
- Tuxera NTFS-3G2026.2.25 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Tuxera NTFS-3G | 2022.10.3 ≤ v < 2026.2.25 | 2026.2.25 |
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