Vulnerability details
CVE-2026-40706
Tuxera NTFS-3G
CVSS 3.1
8.4High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.4High | 3.1 | CVEProject cvelistV5 (CNA) (mitre) | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Tuxera | NTFS-3G | 2022.10.3 ≤ v < 2026.2.25 | CVEProject cvelistV5 (CNA) |
References and advisories
6- https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027
- https://www.openwall.com/lists/oss-security/2026/04/21/4
- https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9
- https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25
- https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html
- http://www.openwall.com/lists/oss-security/2026/04/21/4
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Details
- Published
- 2026-04-21
- Last updated
- 2026-04-22
- State
- Published
- Assigner (CNA)
- mitre
Exploit prediction (EPSS)
0.16%
Probability of exploitation in 30 days
5.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-122Heap-based Buffer Overflow