CVE-2026-40706
CVSS Score
8.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-122 |
| Vendor | tuxera |
| Product | ntfs-3g |
| Published | Apr 21, 2026 |
| Last Updated | Apr 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Tuxera / NTFS-3G
2022.10.3 < 2026.2.25
References
github.com: https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027 openwall.com: https://www.openwall.com/lists/oss-security/2026/04/21/4 github.com: https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9 github.com: https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25 lists.debian.org: https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html openwall.com: http://www.openwall.com/lists/oss-security/2026/04/21/4