UnratedFix available
Fix CVE(s): CVE-2026-4408
Type: advisorySources: OSV
* SECURITY UPDATE: remote command execution via unescaped %u in the "check password script" (samr password validation) - debian/patches/CVE-2026-4408.patch: reject invalid/dangerous account names, mask and single-quote the username before %u substitution, export SAMBA_CPS_ACCOUNT_NAME, and restrict _samr_ValidatePassword to DCs - CVE-2026-4408
- Products
- ctdb, libnss-winbind, libpam-winbind, libparse-pidl-perl, libsmbclient, libsmbclient-dev, libwbclient-dev, libwbclient0, python-samba, registry-tools, samba, samba-common, samba-common-bin, samba-dev, samba-dsdb-modules, samba-libs, samba-testsuite, samba-vfs-modules, smbclient, winbind
- Affected versions
- Not specified
- Fixed versions
- 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
- CVEs
- CVE-2026-4408
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:41 UTC · Revision 1
Source evidence
* SECURITY UPDATE: remote command execution via unescaped %u in the "check password script" (samr password validation) - debian/patches/CVE-2026-4408.patch: reject invalid/dangerous account names, mask and single-quote the username before %u substitution, export SAMBA_CPS_ACCOUNT_NAME, and restrict _samr_ValidatePassword to DCs - CVE-2026-4408
osv:CLSA-2026-1781258405
ctdb
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
libnss-winbind
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
libpam-winbind
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
libparse-pidl-perl
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
libsmbclient
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
libsmbclient-dev
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
libwbclient-dev
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
libwbclient0
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
python-samba
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
registry-tools
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
samba
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
samba-common
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
samba-common-bin
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
samba-dev
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
samba-dsdb-modules
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
samba-libs
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
samba-testsuite
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
samba-vfs-modules
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
smbclient
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
winbind
Fixed versions: 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7
Complete source record
{
"id": "e59d694b9fe2eb82827f886e7cd94621455b91c0473fcbf599045e304d35ac56",
"url": "https://osv.dev/vulnerability/CLSA-2026-1781258405",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-4408",
"summary": "* SECURITY UPDATE: remote command execution via unescaped %u in the \"check password script\" (samr password validation) - debian/patches/CVE-2026-4408.patch: reject invalid/dangerous account names, mask and single-quote the username before %u substitution, export SAMBA_CPS_ACCOUNT_NAME, and restrict _samr_ValidatePassword to DCs - CVE-2026-4408",
"evidence": "osv:CLSA-2026-1781258405",
"products": [
{
"name": {
"value": "ctdb",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnss-winbind",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
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{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libsmbclient",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
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{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libwbclient-dev",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libwbclient0",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-samba",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "registry-tools",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-common",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-common-bin",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-dev",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-dsdb-modules",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-libs",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/15/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-testsuite",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/16/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-vfs-modules",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "smbclient",
"evidence": "/affected/18/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/18/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "winbind",
"evidence": "/affected/19/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7",
"evidence": "/affected/19/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1781258405",
"aliases": [
"CLSA-2026-1781258405"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "ctdb",
"purl": "pkg:deb/tuxcare/ctdb?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "libnss-winbind",
"purl": "pkg:deb/tuxcare/libnss-winbind?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "libpam-winbind",
"purl": "pkg:deb/tuxcare/libpam-winbind?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "libparse-pidl-perl",
"purl": "pkg:deb/tuxcare/libparse-pidl-perl?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
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},
{
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}
]
}
],
"package": {
"name": "libsmbclient",
"purl": "pkg:deb/tuxcare/libsmbclient?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
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},
{
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],
"package": {
"name": "libsmbclient-dev",
"purl": "pkg:deb/tuxcare/libsmbclient-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
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{
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},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "libwbclient-dev",
"purl": "pkg:deb/tuxcare/libwbclient-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "libwbclient0",
"purl": "pkg:deb/tuxcare/libwbclient0?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "python-samba",
"purl": "pkg:deb/tuxcare/python-samba?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "registry-tools",
"purl": "pkg:deb/tuxcare/registry-tools?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:deb/tuxcare/samba?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-common",
"purl": "pkg:deb/tuxcare/samba-common?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "samba-common-bin",
"purl": "pkg:deb/tuxcare/samba-common-bin?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-dev",
"purl": "pkg:deb/tuxcare/samba-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-dsdb-modules",
"purl": "pkg:deb/tuxcare/samba-dsdb-modules?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-libs",
"purl": "pkg:deb/tuxcare/samba-libs?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-testsuite",
"purl": "pkg:deb/tuxcare/samba-testsuite?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "samba-vfs-modules",
"purl": "pkg:deb/tuxcare/samba-vfs-modules?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "smbclient",
"purl": "pkg:deb/tuxcare/smbclient?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+tuxcare.els7"
}
]
}
],
"package": {
"name": "winbind",
"purl": "pkg:deb/tuxcare/winbind?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1781258405.json"
}
}
],
"modified": "2026-10-26T09:32:03.322157129Z",
"provider": "osv",
"upstream": [
"CVE-2026-4408"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1781258405.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": 449510,
"published_at": "2026-06-12T10:00:22+00:00"
}