# CVE-2025-66003: smb4k: An External Control of File Name or Path vulnerability in smb4k allowsl ocal users to perform a local root exploit vi...

CVE-2025-66003 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2025-66003, released January 8, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-66003
- Priority: High
- CVSS: n/a (important)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 8, 2026

## Description

An External Control of File Name or Path vulnerability in smb4k allowsl ocal users to perform a local root exploit via smb4k mounthelper if they can access and control the contents of a Samba shareThis issue affects smb4k: from ? before 4.0.5.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | smb4k Debian 13.5 (trixie) | 4.0.0-1+deb13u1 | [DEBIAN-CVE-2025-66003](https://patchblox.com/security/data/fix/linux/debian-cve-2025-66003.md) | Jan 8, 2026 |
| Linux | smb4k Debian 14 | 4.0.5-1 | [DEBIAN-CVE-2025-66003](https://patchblox.com/security/data/fix/linux/debian-cve-2025-66003.md) | Jan 8, 2026 |
| Linux | smb4k Fedora 43 | 4.0.6-1.fc43 | [FEDORA-2026-9250FDF5CB](https://patchblox.com/security/data/fix/linux/fedora-2026-9250fdf5cb.md) | Apr 9, 2026 |
| Linux | smb4k-debuginfo Fedora 43 | 4.0.6-1.fc43 | [FEDORA-2026-9250FDF5CB](https://patchblox.com/security/data/fix/linux/fedora-2026-9250fdf5cb.md) | Apr 9, 2026 |
| Linux | smb4k-debugsource Fedora 43 | 4.0.6-1.fc43 | [FEDORA-2026-9250FDF5CB](https://patchblox.com/security/data/fix/linux/fedora-2026-9250fdf5cb.md) | Apr 9, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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