In NTFS-3G before 2026.7.7, a heap buffer overflow exists in cat() in ntfscat.c that allows an attacker to corrupt heap memory in the ntfscat binary by crafting a malicious NTFS image. The overflow is triggered by reading a file.

In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfsirtoib() in index.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 by extending a directory, e.g., by creating a file.

In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfsindexwalkdown() in libntfs-3g/index.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 by reading the special crafted file metadata.

In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfsibcopytail(), in libntfs-3g/index.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 by extending a directory, e.g., by creating a file.

In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfsdecompress() in compress.c that allows an attacker to corrupt one byte of heap memory in the SUID-root ntfs-3g binary by crafting a malicious NTFS image. The overflow is triggered by reading the special crafted file.

In NTFS-3G before 2026.7.7, a out-of-bounds read exists in ntfsfixfilename() in libntfs-3g/reparse.c that allows an attacker to read possibly confidential information in ntfs-3g process memory by crafting a malicious NTFS image. The out-of-bounds read is triggered by a readlink on a corrupted file.

In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfsibcuttail() in libntfs-3g/index.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 by creating a file in a specially crafted directory.

Hello oss-security, Below is the list of vulnerabilities with their CVSS score and severity: [NTFS-3G-SA2026-06-120] Heap buffer overflow in ntfsaclowner() CVSS: 6.2 Severity: Moderate Credit: Jurre van Bergen

[NTFS-3G-SA2026-06-119] Heap buffer overflow in ntfssamesid() CVSS: 6.8 Severity: Moderate Credit: Jurre van Bergen CVSS: 6.2 Severity: Moderate Credit: Jurre van Bergen

[NTFS-3G-SA2026-06-111] Heap buffer overflow in ntfscheckrestartarea() CVSS: 2.9 Severity: Low Credit: Jurre van Bergen

[NTFS-3G-SA2026-06-110] Heap buffer overflow in ntfseacheckwsldev() CVSS: 4.0 Severity: Moderate Credit: Matthieu Olivier at ANSSI and Jurre van Bergen

[NTFS-3G-SA2026-06-108] Heap buffer overflow in ntfsexternalattrfind() CVSS: 2.9 Severity: Low Credit: Jurre van Bergen CVSS: 2.9 Severity: Low Credit: Jurre van Bergen

[NTFS-3G-SA2026-06-105] Heap out of bounds read/write in ntfsieaddvcn() CVSS: 6.2 Severity: Moderate Credit: Jurre van Bergen Links to the latest version with fixes and patches for older versions:

https://download.tuxera.com/opensource/ea5899b4ab87d243f6bed2f8fc13e6e5ff1f6d51fdf22b2ccbe708c8c0256166/ntfs-3g-2026.9.18.tar.gz https://download.tuxera.com/opensource/ea5899b4ab87d243f6bed2f8fc13e6e5ff1f6d51fdf22b2ccbe708c8c0256166/ntfs-3g2022.10.3SR2026-09patches.tar.gz https://download.tuxera.com/opensource/ea5899b4ab87d243f6bed2f8fc13e6e5ff1f6d51fdf22b2ccbe708c8c0256166/ntfs-3g2026.7.7SR2026-09patches.tar.gz

SHA256 checksums:

In NTFS-3G through 2026.2.25, a heap-based buffer overflow exists in the function buildinheritedid() in libntfs-3g/security.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 by creating a file in a crafted directory.

In NTFS-3G through 2026.2.25, an out-of-bounds read exists in ntfsirnill() in libntfs-3g/index.c that allows an attacker to read possibly confidential information in an ntfs-3g process by crafting a malicious NTFS image. This read operation is triggered by creation of a file with a crafted name.

Hello oss-security, The following vulnerabilities have been fixed: Direct link to download version 2026.7.7: https://tuxera.com/opensource/ntfs-3gntfsprogs-2026.7.7.tgz

Patches that can be applied on top of version 2026.2.25: https://download.tuxera.com/opensource/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/ntfs-3g2026.2.25cve2026-04patches.tar.gz

Patches that can be applied on top of version 2022.10.3: https://download.tuxera.com/opensource/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/ntfs-3g2022.10.3cve2026-04patches.tar.gz

SHA256 checksums:

Hello oss-security, Short description: CVSS 3.1: 7.8 (High) — AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References: CVE ID: CVE-2026-40706 Fixed version: https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25

Credits: reported by Andrea Bocchetti

In NTFS-3G 2022.10.3 before 2026.2.25, a heap buffer overflow exists in ntfsbuildpermissionsposix() 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 ACCESSDENIED ACEs containing WRITEOWNER from distinct group SIDs.

NTFS-3G before 75dcdc2 has a use-after-free in ntfsuppercasembs in libntfs-3g/unistr.c. NOTE: discussion suggests that exploitation would be challenging.

A buffer overflow was discovered in NTFS-3G before 2022.10.3. Crafted metadata in an NTFS image can cause code execution. A local attacker can exploit this if the ntfs-3g binary is setuid root. A physically proximate attacker can exploit this if NTFS-3G software is configured to execute upon attachment of an external storage device.

A buffer overflow was discovered in NTFS-3G before 2022.10.3. Crafted metadata in an NTFS image can cause code execution. A local attacker can exploit this if the ntfs-3g binary is setuid root. A physically proximate attacker can exploit this if NTFS-3G software is configured to execute upon attachment of an external storage device.

An invalid return code in fusekernmount enables intercepting of libfuse-lite protocol traffic between NTFS-3G and the kernel in NTFS-3G through 2021.8.22 when using libfuse-lite.

A crafted NTFS image can cause heap exhaustion in ntfsgetattributevalue in NTFS-3G through 2021.8.22.

A file handle created in fuselibopendir, and later used in fuselibreaddir, enables arbitrary memory read and write operations in NTFS-3G through 2021.8.22 when using libfuse-lite.

A crafted NTFS image can cause a heap-based buffer overflow in ntfsnamesfullcollate in NTFS-3G through 2021.8.22.

An integer underflow in fuselibreaddir enables arbitrary memory read operations in NTFS-3G through 2021.8.22 when using libfuse-lite.

A crafted NTFS image can cause a heap-based buffer overflow in ntfsmftrecalloc in NTFS-3G through 2021.8.22.

A crafted NTFS image can cause a heap-based buffer overflow in ntfschecklogclientarray in NTFS-3G through 2021.8.22.

ntfsck in NTFS-3G through 2021.8.22 has a heap-based buffer overflow involving buffer+5123-2. NOTE: the upstream position is that ntfsck is deprecated; however, it is shipped by some Linux distributions.

A crafted NTFS image can trigger a heap-based buffer overflow, caused by an unsanitized attribute in ntfsgetattributevalue, in NTFS-3G < 2021.8.22.

A crafted NTFS image can cause an out-of-bounds access in ntfsinodesyncstandardinformation in NTFS-3G < 2021.8.22.

A crafted NTFS image with an unallocated bitmap can lead to a endless recursive function call chain (starting from ntfsattrpwrite), causing stack consumption in NTFS-3G < 2021.8.22.

A crafted NTFS image can cause a heap-based buffer overflow in ntfsinodelookupbyname in NTFS-3G < 2021.8.22.

A crafted NTFS image can trigger an out-of-bounds read, caused by an invalid attribute in ntfsattrfindinattrdef, in NTFS-3G < 2021.8.22.

A crafted NTFS image can cause an out-of-bounds read in ntfsielookup in NTFS-3G < 2021.8.22.