Out-of-bounds read in NTFS-3G - CVE-2026-46571
Published: November 5, 2026
Vulnerability identifier: #VU159433
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-46571
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose potentially confidential information from NTFS-3G process memory.
The vulnerability exists due to an out-of-bounds read in ntfs_fix_file_name() in libntfs-3g/reparse.c when processing a readlink operation on a corrupted file. A local user can craft a malicious NTFS image that triggers the out-of-bounds read during this operation to disclose potentially confidential process memory.
The vulnerable behavior occurs when the ignore_case mount option is used.
Affected software
NTFS-3G
Gentoo Linux
Debian Linux
Fedora
openEuler
Ubuntu
ntfs-3g (Ubuntu package)
libntfs-3g89 (Ubuntu package)
libntfs-3g89t64 (Ubuntu package)
ntfs-3g-help
ntfs-3g
ntfs-3g-debuginfo
ntfs-3g-debugsource
ntfs-3g-devel
sys-fs/ntfs3g
ntfs-3g (Debian package)
Gentoo Linux
Debian Linux
Fedora
openEuler
Ubuntu
ntfs-3g (Ubuntu package)
libntfs-3g89 (Ubuntu package)
libntfs-3g89t64 (Ubuntu package)
ntfs-3g-help
ntfs-3g
ntfs-3g-debuginfo
ntfs-3g-debugsource
ntfs-3g-devel
sys-fs/ntfs3g
ntfs-3g (Debian package)
How to mitigate CVE-2026-46571
Install security update from vendor's website.
NTFS-3G - update to 2026.7.7
ntfs-3g (Ubuntu package) - addressed in versions 1:2021.8.22-3ubuntu1.4, 1:2022.10.3-1.2ubuntu3.2, 1:2022.10.3-5ubuntu1.1
libntfs-3g89 (Ubuntu package) - update to 1:2021.8.22-3ubuntu1.4
libntfs-3g89t64 (Ubuntu package) - addressed in versions 1:2022.10.3-1.2ubuntu3.2, 1:2022.10.3-5ubuntu1.1
ntfs-3g-help - update to 2022.10.3-4
ntfs-3g - update to 2022.10.3-4
ntfs-3g-debuginfo - update to 2022.10.3-4
ntfs-3g-debugsource - update to 2022.10.3-4
ntfs-3g-devel - update to 2022.10.3-4
ntfs-3g - addressed in versions 2022.10.3-11.el9, 2022.10.3-12.el9, 2026.7.7-2.el10_4, 2026.9.18-1.el10_4
sys-fs/ntfs3g - update to 2026.7.7
ntfs-3g (Debian package) - update to 1:2022.10.3-5+deb13u2
ntfs-3g (Ubuntu package) - addressed in versions 1:2021.8.22-3ubuntu1.4, 1:2022.10.3-1.2ubuntu3.2, 1:2022.10.3-5ubuntu1.1
libntfs-3g89 (Ubuntu package) - update to 1:2021.8.22-3ubuntu1.4
libntfs-3g89t64 (Ubuntu package) - addressed in versions 1:2022.10.3-1.2ubuntu3.2, 1:2022.10.3-5ubuntu1.1
ntfs-3g-help - update to 2022.10.3-4
ntfs-3g - update to 2022.10.3-4
ntfs-3g-debuginfo - update to 2022.10.3-4
ntfs-3g-debugsource - update to 2022.10.3-4
ntfs-3g-devel - update to 2022.10.3-4
ntfs-3g - addressed in versions 2022.10.3-11.el9, 2022.10.3-12.el9, 2026.7.7-2.el10_4, 2026.9.18-1.el10_4
sys-fs/ntfs3g - update to 2026.7.7
ntfs-3g (Debian package) - update to 1:2022.10.3-5+deb13u2