CriticalFix available
dovecot — security advisory
When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known.
- Products
- dovecot
- Affected versions
- 1:2.4.1+dfsg1-6, 1:2.4.1+dfsg1-6+deb13u1, 1:2.4.1+dfsg1-6+deb13u2, 1:2.4.1+dfsg1-6+deb13u3, 1:2.4.1+dfsg1-6+deb13u4, 1:2.4.1+dfsg1-6+deb13u5, 1:2.4.1+dfsg1-7, 1:2.4.1+dfsg1-8, 1:2.4.1+dfsg1-9, 1:2.4.2+dfsg1-1, 1:2.4.2+dfsg1-2, 1:2.4.2+dfsg1-3, 1:2.4.2+dfsg1-4, 1:2.4.3+dfsg1-1, 1:2.4.3+dfsg1-2
- Fixed versions
- 1:2.4.1+dfsg1-6+deb13u6, 1:2.4.4+dfsg1-1
- CVEs
- CVE-2026-27851
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:47 UTC · Revision 2
Source evidence
When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known.
osv:DEBIAN-CVE-2026-27851
dovecot
Fixed versions: 1:2.4.1+dfsg1-6+deb13u6
dovecot
Fixed versions: 1:2.4.4+dfsg1-1
Complete source record
{
"id": "519b9bd8bcb1aecb5d1bfa38b96b8787dc397e7da6e03879a2aade929a2ef1e7",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-27851",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-27851",
"summary": "When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known.",
"evidence": "osv:DEBIAN-CVE-2026-27851",
"products": [
{
"name": {
"value": "dovecot",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.4.1+dfsg1-6+deb13u6",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1:2.4.1+dfsg1-6",
"evidence": "/affected/0/versions"
},
{
"value": "1:2.4.1+dfsg1-6+deb13u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:2.4.1+dfsg1-6+deb13u2",
"evidence": "/affected/0/versions"
},
{
"value": "1:2.4.1+dfsg1-6+deb13u3",
"evidence": "/affected/0/versions"
},
{
"value": "1:2.4.1+dfsg1-6+deb13u4",
"evidence": "/affected/0/versions"
},
{
"value": "1:2.4.1+dfsg1-6+deb13u5",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "dovecot",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.4.4+dfsg1-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1:2.4.1+dfsg1-6",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4.1+dfsg1-7",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4.1+dfsg1-8",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4.1+dfsg1-9",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4.2+dfsg1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4.2+dfsg1-2",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4.2+dfsg1-3",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4.2+dfsg1-4",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4.3+dfsg1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4.3+dfsg1-2",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-27851",
"aliases": [
"DEBIAN-CVE-2026-27851"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.4.1+dfsg1-6+deb13u6"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:deb/debian/dovecot?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1:2.4.1+dfsg1-6",
"1:2.4.1+dfsg1-6+deb13u1",
"1:2.4.1+dfsg1-6+deb13u2",
"1:2.4.1+dfsg1-6+deb13u3",
"1:2.4.1+dfsg1-6+deb13u4",
"1:2.4.1+dfsg1-6+deb13u5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27851.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.4.4+dfsg1-1"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:deb/debian/dovecot?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1:2.4.1+dfsg1-6",
"1:2.4.1+dfsg1-7",
"1:2.4.1+dfsg1-8",
"1:2.4.1+dfsg1-9",
"1:2.4.2+dfsg1-1",
"1:2.4.2+dfsg1-2",
"1:2.4.2+dfsg1-3",
"1:2.4.2+dfsg1-4",
"1:2.4.3+dfsg1-1",
"1:2.4.3+dfsg1-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27851.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:41.471942312Z",
"provider": "osv",
"upstream": [
"CVE-2026-27851"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-27851"
]
},
"related_cves": [
{
"value": "CVE-2026-27851",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 461190,
"published_at": "2026-05-12T14:16:56.857+00:00"
}