CVE-2025-66003

Local users can perform a local root exploit via smb4k mounthelper

7.3 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: High
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.12%Up 0.1 points since Jan 9, 2026

What each source reports

CVE List Score used 7.3

Local users can perform a local root exploit via smb4k mounthelper

Record: CVE-2025-66003
CVSS 4.0: 7.3 HighCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-73
Updated: 2026-11-02

EUVDEUVD-2026-1571 7.3

Record: EUVD-2026-1571
CVSS 4.0: 7.3 HighCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-c32g-xjp2-p4pw 7.3

An External Control of File Name or Path vulnerability in smb4k allowsl ocal users to perform a...

Record: GHSA-c32g-xjp2-p4pw
CVSS 4.0: 7.3 HighCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-73
Updated: 2026-11-02

NVD 7.3

Record: CVE-2025-66003
CVSS 4.0: 7.3 HighCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-73
Updated: 2026-11-02

OSVDEBIAN-CVE-2025-66003 7.3

Record: DEBIAN-CVE-2025-66003
CVSS 4.0: 7.3 HighCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

OSVUBUNTU-CVE-2025-66003 7.3

Record: UBUNTU-CVE-2025-66003
CVSS 4.0: 7.3 HighCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

Affected products

https://github.com/kde/ smb4k

Affected packages

Affected packages
Package	Affected	Fixed
`smb4k` Debian:13	before 4.0.0-1+deb13u1, plus listed versions 4.0.0-1	4.0.0-1+deb13u1
`smb4k` Debian:14	before 4.0.5-1, plus listed versions 4.0.0-14.0.4-1	4.0.5-1
`smb4k` Debian:13 From an advisory covering 2 CVEs	before 4.0.0-1+deb13u1, plus listed versions 4.0.0-1	4.0.0-1+deb13u1
`smb4k` Ubuntu:16.04:LTS	All versions, plus listed versions 1.1.2-1	None known
`smb4k` Ubuntu:18.04:LTS	All versions, plus listed versions 2.0.1-12.0.2-12.1.0-1	None known
`smb4k` Ubuntu:20.04:LTS	All versions, plus listed versions 3.0.2-13.0.3-13.0.4-0ubuntu13.0.4-1	None known
`smb4k` Ubuntu:22.04:LTS	All versions, plus listed versions 3.1.1-13.1.2-0ubuntu1	None known
`smb4k` Ubuntu:24.04:LTS	All versions, plus listed versions 3.2.2-13.2.4-13.2.5-13.2.5-1build13.2.5-1build2	None known
`smb4k` Ubuntu:25.10	All versions, plus listed versions 4.0.0-14.0.4-1	None known
`smb4k` Ubuntu:26.10	All versions, plus listed versions 4.0.6-1	None known
`smb4k` Ubuntu:26.04:LTS	All versions, plus listed versions 4.0.4-14.0.5-14.0.5-1build14.0.6-1	None known

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-66003 is a high vulnerability (CVSS 7.3) in Https://github.com/kde/ Smb4k, published January 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. Fixed in smb4k 4.0.0-1+deb13u1.