Vulnerability · Published Oct 7, 2026 · Assigned by mitre
CVE-2026-42617
High 7.1
In plain English
A high-severity heap buffer overflow in the ntfs-3g package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.1%top 96.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs_ir_to_ib() 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ntfs-3g | 1:2022.10.3-1+deb12u4 | DEBIAN-CVE-2026-42617 |
| Debian:13 | ntfs-3g | 1:2022.10.3-5+deb13u2 | DEBIAN-CVE-2026-42617 |
| Debian:14 | ntfs-3g | 1:2026.7.7-2 | DEBIAN-CVE-2026-42617 |
| Ubuntu:22.04:LTS | ntfs-3g | 1:2021.8.22-3ubuntu1.4 | USN-8554-1 |
| Ubuntu:22.04:LTS | ntfs-3g | 1:2021.8.22-3ubuntu1.4 | UBUNTU-CVE-2026-42617 |
| Ubuntu:24.04:LTS | ntfs-3g | 1:2022.10.3-1.2ubuntu3.2 | USN-8554-1 |
| Ubuntu:24.04:LTS | ntfs-3g | 1:2022.10.3-1.2ubuntu3.2 | UBUNTU-CVE-2026-42617 |
| Ubuntu:26.04:LTS | ntfs-3g | 1:2022.10.3-5ubuntu1.1 | UBUNTU-CVE-2026-42617 |
| Ubuntu:26.04:LTS | ntfs-3g | 1:2022.10.3-5ubuntu1.1 | USN-8554-1 |
Affected products (as reported)
Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H