MediumFix available
samba — security advisory
A flaw was found in Samba’s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.
- Products
- samba
- Affected versions
- 2:4.17.10+dfsg-0+deb12u1, 2:4.17.10+dfsg-0+deb12u1~bpo11+1, 2:4.17.11+dfsg-0+deb12u1, 2:4.17.12+dfsg-0+deb12u1, 2:4.17.12+dfsg-0+deb12u1~bpo11+1, 2:4.17.12+dfsg-0+deb12u2, 2:4.17.12+dfsg-0+deb12u3, 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, 2:4.17.9+dfsg-0+deb12u3~bpo11+1, 2:4.22.3+dfsg-4, 2:4.22.4+dfsg-1, 2:4.22.4+dfsg-1~deb13u1, 2:4.22.4+dfsg-1~deb13u1~bpo12+1, 2:4.22.6+dfsg-0+deb13u1, 2:4.22.6+dfsg-0+deb13u1~bpo12+1, 2:4.22.8+dfsg-0+deb13u1, 2:4.23.0+dfsg-1, 2:4.23.0+dfsg-2, 2:4.23.0+dfsg-3, 2:4.23.0~rc1+dfsg-1, 2:4.23.0~rc2+dfsg-1, 2:4.23.0~rc3+dfsg-1, 2:4.23.1+dfsg-1, 2:4.23.2+dfsg-1, 2:4.23.3+dfsg-1, 2:4.23.3+dfsg-1~bpo13+1, 2:4.23.4+dfsg-1, 2:4.23.4+dfsg-1~bpo13+1, 2:4.23.5+dfsg-1, 2:4.23.5+dfsg-1~bpo13+1, 2:4.23.6+dfsg-1, 2:4.23.6+dfsg-2, 2:4.23.6+dfsg-2~bpo13+1, 2:4.24.0+dfsg-1, 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, 2:4.24.1+dfsg-1, 2:4.24.2+dfsg-1, 2:4.24.2+dfsg-1~bpo13+1, 2:4.24.3+dfsg-1~bpo13+1
- Fixed versions
- 2:4.17.12+dfsg-0+deb12u4, 2:4.22.8+dfsg-0+deb13u2, 2:4.24.3+dfsg-1
- CVEs
- CVE-2026-2340
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 19:56 UTC · Revision 1
Source evidence
A flaw was found in Samba’s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.
osv:DEBIAN-CVE-2026-2340
samba
Fixed versions: 2:4.17.12+dfsg-0+deb12u4
samba
Fixed versions: 2:4.22.8+dfsg-0+deb13u2
samba
Fixed versions: 2:4.24.3+dfsg-1
Complete source record
{
"id": "c5a6e1aada6c79128ccadc320a0e7f7809a9f35c76dc2efe092ec70f02eada1f",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-2340",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-2340",
"summary": "A flaw was found in Samba’s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.",
"evidence": "osv:DEBIAN-CVE-2026-2340",
"products": [
{
"name": {
"value": "samba",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.17.12+dfsg-0+deb12u4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "2:4.17.10+dfsg-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.10+dfsg-0+deb12u1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.11+dfsg-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.12+dfsg-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.12+dfsg-0+deb12u1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.12+dfsg-0+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.12+dfsg-0+deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.8+dfsg-2",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.8+dfsg-2.1",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.9+dfsg-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.9+dfsg-0+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.9+dfsg-0+deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "2:4.17.9+dfsg-0+deb12u3~bpo11+1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "samba",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.22.8+dfsg-0+deb13u2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "2:4.22.3+dfsg-4",
"evidence": "/affected/1/versions"
},
{
"value": "2:4.22.4+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "2:4.22.4+dfsg-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "2:4.22.4+dfsg-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "2:4.22.6+dfsg-0+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "2:4.22.6+dfsg-0+deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "2:4.22.8+dfsg-0+deb13u1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "samba",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.24.3+dfsg-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "2:4.22.3+dfsg-4",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.22.4+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.22.4+dfsg-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.22.4+dfsg-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.0+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.0+dfsg-3",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.0~rc1+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.0~rc2+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.0~rc3+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.1+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.2+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.3+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.3+dfsg-1~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.4+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.4+dfsg-1~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.5+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.5+dfsg-1~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.6+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.6+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.23.6+dfsg-2~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.24.0+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.24.0~rc1+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.24.0~rc1+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.24.0~rc1+dfsg-3",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.24.0~rc2+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.24.1+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.24.2+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.24.2+dfsg-1~bpo13+1",
"evidence": "/affected/2/versions"
},
{
"value": "2:4.24.3+dfsg-1~bpo13+1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-2340",
"aliases": [
"DEBIAN-CVE-2026-2340"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.17.12+dfsg-0+deb12u4"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:deb/debian/samba?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2:4.17.10+dfsg-0+deb12u1",
"2:4.17.10+dfsg-0+deb12u1~bpo11+1",
"2:4.17.11+dfsg-0+deb12u1",
"2:4.17.12+dfsg-0+deb12u1",
"2:4.17.12+dfsg-0+deb12u1~bpo11+1",
"2:4.17.12+dfsg-0+deb12u2",
"2:4.17.12+dfsg-0+deb12u3",
"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",
"2:4.17.9+dfsg-0+deb12u3~bpo11+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-2340.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.22.8+dfsg-0+deb13u2"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:deb/debian/samba?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2:4.22.3+dfsg-4",
"2:4.22.4+dfsg-1",
"2:4.22.4+dfsg-1~deb13u1",
"2:4.22.4+dfsg-1~deb13u1~bpo12+1",
"2:4.22.6+dfsg-0+deb13u1",
"2:4.22.6+dfsg-0+deb13u1~bpo12+1",
"2:4.22.8+dfsg-0+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-2340.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.24.3+dfsg-1"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:deb/debian/samba?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2:4.22.3+dfsg-4",
"2:4.22.4+dfsg-1",
"2:4.22.4+dfsg-1~deb13u1",
"2:4.22.4+dfsg-1~deb13u1~bpo12+1",
"2:4.23.0+dfsg-1",
"2:4.23.0+dfsg-2",
"2:4.23.0+dfsg-3",
"2:4.23.0~rc1+dfsg-1",
"2:4.23.0~rc2+dfsg-1",
"2:4.23.0~rc3+dfsg-1",
"2:4.23.1+dfsg-1",
"2:4.23.2+dfsg-1",
"2:4.23.3+dfsg-1",
"2:4.23.3+dfsg-1~bpo13+1",
"2:4.23.4+dfsg-1",
"2:4.23.4+dfsg-1~bpo13+1",
"2:4.23.5+dfsg-1",
"2:4.23.5+dfsg-1~bpo13+1",
"2:4.23.6+dfsg-1",
"2:4.23.6+dfsg-2",
"2:4.23.6+dfsg-2~bpo13+1",
"2:4.24.0+dfsg-1",
"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",
"2:4.24.1+dfsg-1",
"2:4.24.2+dfsg-1",
"2:4.24.2+dfsg-1~bpo13+1",
"2:4.24.3+dfsg-1~bpo13+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-2340.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-16T09:47:25.548278101Z",
"provider": "osv",
"upstream": [
"CVE-2026-2340"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-2340"
]
},
"related_cves": [
{
"value": "CVE-2026-2340",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 338565,
"published_at": "2026-05-27T14:16:44.387+00:00"
}