CVE-2026-40706
CVE-2026-40706
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 8.4EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
21 Apr 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Tuxera · NTFS-3GReferences
https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9https://lists.debian.org/debian-lts-announce/2026/04/msg00024.htmlhttps://www.openwall.com/lists/oss-security/2026/04/21/4http://www.openwall.com/lists/oss-security/2026/04/21/4