# CVE-2026-56136: In NTFS-3G through 2026.2.25, an out-of-bounds read exists in ntfs_ir_nill() 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.

CVE-2026-56136 is fixed in 4 products on 1 platform, first by libntfs-3g89t64 1:2022.10.3-5ubuntu1.1, released July 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-56136
- Priority: High
- CVSS: 7.1 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 15, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56136

## Description

In NTFS-3G through 2026.2.25, an out-of-bounds read exists in ntfs_ir_nill() 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libntfs-3g89 Ubuntu 22.04.1 LTS (jammy) | 1:2021.8.22-3ubuntu1.4 | [libntfs-3g89 1:2021.8.22-3ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libntfs-3g89-1-2021.8.22-3ubuntu1.4.md) | Jul 18, 2026 |
| Linux | libntfs-3g89t64 Ubuntu 24.04.5 LTS (noble) | 1:2022.10.3-1.2ubuntu3.2 | [libntfs-3g89t64 1:2022.10.3-1.2ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libntfs-3g89t64-1-2022.10.3-1.2ubuntu3.2.md) | Jul 18, 2026 |
| Linux | libntfs-3g89t64 Ubuntu 26.04.1 LTS (resolute) | 1:2022.10.3-5ubuntu1.1 | [libntfs-3g89t64 1:2022.10.3-5ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libntfs-3g89t64-1-2022.10.3-5ubuntu1.1.md) | Jul 15, 2026 |
| Linux | ntfs-3g Debian 12.15 (bookworm) | 1:2022.10.3-1+deb12u4 | [DEBIAN-CVE-2026-56136](https://patchblox.com/security/data/fix/linux/debian-cve-2026-56136.md) | Jul 18, 2026 |
| Linux | ntfs-3g Debian 13.5 (trixie) | 1:2022.10.3-5+deb13u2 | [DEBIAN-CVE-2026-56136](https://patchblox.com/security/data/fix/linux/debian-cve-2026-56136.md) | Jul 18, 2026 |
| Linux | ntfs-3g Debian 14 | 1:2026.7.7-2 | [DEBIAN-CVE-2026-56136](https://patchblox.com/security/data/fix/linux/debian-cve-2026-56136.md) | Jul 18, 2026 |
| Linux | ntfs-3g Ubuntu 22.04.1 LTS (jammy) | 1:2021.8.22-3ubuntu1.4 | [ntfs-3g 1:2021.8.22-3ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ntfs-3g-1-2021.8.22-3ubuntu1.4.md) | Jul 18, 2026 |
| Linux | ntfs-3g Ubuntu 24.04.5 LTS (noble) | 1:2022.10.3-1.2ubuntu3.2 | [ntfs-3g 1:2022.10.3-1.2ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ntfs-3g-1-2022.10.3-1.2ubuntu3.2.md) | Jul 18, 2026 |
| Linux | ntfs-3g Ubuntu 26.04.1 LTS (resolute) | 1:2022.10.3-5ubuntu1.1 | [ntfs-3g 1:2022.10.3-5ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-ntfs-3g-1-2022.10.3-5ubuntu1.1.md) | Jul 15, 2026 |
| Linux | ntfs-3g_ntfsprogs opensuse-leap 16.0 | 2022.10.3-160000.4.1 | [OPENSUSE-SU-2026:21484-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21484-1.md) | Jul 30, 2026 |
| Linux | ntfs-3g_ntfsprogs sles 15.6 | 2022.5.17-150000.3.27.1 | [SUSE-SU-2026:3214-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3214-1.md) | Jul 23, 2026 |
| Linux | ntfs-3g_ntfsprogs sles 15.7 | 2022.5.17-150000.3.27.1 | [SUSE-SU-2026:3214-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3214-1.md) | Jul 23, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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