CVE-2026-40706
8.4
HIGH
CVSS 3.1
EPSS 0.02%
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.
How to fix CVE-2026-40706
To remediate CVE-2026-40706, upgrade the affected package to a fixed version below.
- —upgrade to 2026.2.25-r0 or later
- —upgrade to 1:2017.3.23AR.3-4+deb11u5 or later
Is CVE-2026-40706 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2026.2.25-r0
- from 0, < 1:2017.3.23AR.3-4+deb11u5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.4 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |