CVE-2025-66003: Local users can perform a local root exploit via smb4k mounthelper

Severity: high (CVSS 7.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-08 · updated 2026-10-11
Weakness: CWE-73

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.

Affected products

https://github.com/KDE/ smb4k: from ? before 4.0.5 — fixed in 4.0.5

How to fix

Upgrade to a fixed version: https://github.com/KDE/ smb4k 4.0.5. Check the vendor advisory for mitigations.

References

https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-66003
https://security.opensuse.org/2025/12/10/smb4k-major-issues-in-kauth-helper.html

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