DEBIAN-CVE-2026-4408

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Source
https://security-tracker.debian.org/tracker/CVE-2026-4408
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4408.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-4408
Upstream
Published
2026-05-28T09:16:47Z
Modified
2026-09-18T08:47:24Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the "check password script" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the "check password script" is used with %u and the samba-dcerpcd service is started as a system service.

References

Affected packages

Debian:12 / samba

Package

Name
samba
Purl
pkg:deb/debian/samba?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:4.17.12+dfsg-0+deb12u4

Affected versions

2:4.*
2:4.17.8+dfsg-2
2:4.17.8+dfsg-2.1
2:4.17.9+dfsg-0+deb12u1
2:4.17.9+dfsg-0+deb12u2
2:4.17.9+dfsg-0+deb12u3~bpo11+1
2:4.17.9+dfsg-0+deb12u3
2:4.17.10+dfsg-0+deb12u1~bpo11+1
2:4.17.10+dfsg-0+deb12u1
2:4.17.11+dfsg-0+deb12u1
2:4.17.12+dfsg-0+deb12u1~bpo11+1
2:4.17.12+dfsg-0+deb12u1
2:4.17.12+dfsg-0+deb12u2
2:4.17.12+dfsg-0+deb12u3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4408.json"

Debian:13 / samba

Package

Name
samba
Purl
pkg:deb/debian/samba?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:4.22.8+dfsg-0+deb13u2

Affected versions

2:4.*
2:4.22.3+dfsg-4
2:4.22.4+dfsg-1~deb13u1~bpo12+1
2:4.22.4+dfsg-1~deb13u1
2:4.22.4+dfsg-1
2:4.22.6+dfsg-0+deb13u1~bpo12+1
2:4.22.6+dfsg-0+deb13u1
2:4.22.8+dfsg-0+deb13u1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4408.json"

Debian:14 / samba

Package

Name
samba
Purl
pkg:deb/debian/samba?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:4.24.3+dfsg-1

Affected versions

2:4.*
2:4.22.3+dfsg-4
2:4.22.4+dfsg-1~deb13u1~bpo12+1
2:4.22.4+dfsg-1~deb13u1
2:4.22.4+dfsg-1
2:4.23.0~rc1+dfsg-1
2:4.23.0~rc2+dfsg-1
2:4.23.0~rc3+dfsg-1
2:4.23.0+dfsg-1
2:4.23.0+dfsg-2
2:4.23.0+dfsg-3
2:4.23.1+dfsg-1
2:4.23.2+dfsg-1
2:4.23.3+dfsg-1~bpo13+1
2:4.23.3+dfsg-1
2:4.23.4+dfsg-1~bpo13+1
2:4.23.4+dfsg-1
2:4.23.5+dfsg-1~bpo13+1
2:4.23.5+dfsg-1
2:4.23.6+dfsg-1
2:4.23.6+dfsg-2~bpo13+1
2:4.23.6+dfsg-2
2:4.24.0~rc1+dfsg-1
2:4.24.0~rc1+dfsg-2
2:4.24.0~rc1+dfsg-3
2:4.24.0~rc2+dfsg-1
2:4.24.0+dfsg-1
2:4.24.1+dfsg-1
2:4.24.2+dfsg-1~bpo13+1
2:4.24.2+dfsg-1
2:4.24.3+dfsg-1~bpo13+1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4408.json"