UnratedFix available
samba: Fix of CVE-2026-4408
Type: advisorySources: OSV
- CVE-2026-4408: Escape/mask client-controlled username before %u substitution in 'check password script' to prevent remote command execution; restrict _samr_ValidatePassword to DCs
- Products
- libsmbclient, libsmbclient-devel, samba, samba-client, samba-common, samba-doc, samba-domainjoin-gui, samba-glusterfs, samba-swat, samba-winbind, samba-winbind-clients, samba-winbind-devel, samba-winbind-krb5-locator
- Affected versions
- Not specified
- Fixed versions
- 3.6.23-53.el6_10.tuxcare.els7
- CVEs
- CVE-2026-4408
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:59 UTC · Revision 1
Source evidence
- CVE-2026-4408: Escape/mask client-controlled username before %u substitution in 'check password script' to prevent remote command execution; restrict _samr_ValidatePassword to DCs
osv:CLSA-2026-1781627407
libsmbclient
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
libsmbclient-devel
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-client
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-common
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-doc
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-domainjoin-gui
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-glusterfs
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-swat
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-winbind
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-winbind-clients
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-winbind-devel
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
samba-winbind-krb5-locator
Fixed versions: 3.6.23-53.el6_10.tuxcare.els7
Complete source record
{
"id": "b52b8810384377891af6bf13be2ec068a2433c444fe2d4d892606aa3858f7070",
"url": "https://osv.dev/vulnerability/CLSA-2026-1781627407",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "samba: Fix of CVE-2026-4408",
"summary": "- CVE-2026-4408: Escape/mask client-controlled username before %u substitution in 'check password script' to prevent remote command execution; restrict _samr_ValidatePassword to DCs",
"evidence": "osv:CLSA-2026-1781627407",
"products": [
{
"name": {
"value": "libsmbclient",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libsmbclient-devel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-client",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-common",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-doc",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-domainjoin-gui",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-glusterfs",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-swat",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-winbind",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-winbind-clients",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-winbind-devel",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-winbind-krb5-locator",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.23-53.el6_10.tuxcare.els7",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1781627407",
"aliases": [
"CLSA-2026-1781627407"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "libsmbclient",
"purl": "pkg:rpm/tuxcare/libsmbclient?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "libsmbclient-devel",
"purl": "pkg:rpm/tuxcare/libsmbclient-devel?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:rpm/tuxcare/samba?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-client",
"purl": "pkg:rpm/tuxcare/samba-client?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-common",
"purl": "pkg:rpm/tuxcare/samba-common?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-doc",
"purl": "pkg:rpm/tuxcare/samba-doc?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-domainjoin-gui",
"purl": "pkg:rpm/tuxcare/samba-domainjoin-gui?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-glusterfs",
"purl": "pkg:rpm/tuxcare/samba-glusterfs?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-swat",
"purl": "pkg:rpm/tuxcare/samba-swat?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-winbind",
"purl": "pkg:rpm/tuxcare/samba-winbind?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-winbind-clients",
"purl": "pkg:rpm/tuxcare/samba-winbind-clients?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-winbind-devel",
"purl": "pkg:rpm/tuxcare/samba-winbind-devel?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.23-53.el6_10.tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-winbind-krb5-locator",
"purl": "pkg:rpm/tuxcare/samba-winbind-krb5-locator?distro=centos-6",
"ecosystem": "TuxCare:CentOS:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos6els/CLSA-2026-1781627407.json"
}
}
],
"modified": "2026-10-26T09:31:39.364618284Z",
"provider": "osv",
"upstream": [
"CVE-2026-4408"
],
"references": [
"https://errata.tuxcare.com/els_os/centos6els/CLSA-2026-1781627407.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-4408"
]
},
"related_cves": [
{
"value": "CVE-2026-4408",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 447995,
"published_at": "2026-06-22T14:45:51+00:00"
}