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Vulnerability record · CVE-2026-40706 · published 21 April 2026

CVE-2026-40706: Heap-based buffer overflow vulnerability

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.

8.4 CVSS 3.1 High EPSS 0.21% · top 89.7% CWE-122 · Heap-based buffer overflow Awaiting Analysis
8.4CVSS 3.1 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027
https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25
https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9
https://www.openwall.com/lists/oss-security/2026/04/21/4
http://www.openwall.com/lists/oss-security/2026/04/21/4
https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html

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Source: NIST National Vulnerability Database (record CVE-2026-40706), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.