LowFix available
cyrus-imapd — security advisory
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is heap exposure in nested MIME comment parsing. An authenticated IMAP user could craft an email message containing an RFC 822 comment ending with a backslash. When parsing the message, the server would read past the message's end in memory, and read into the heap, returning the read content to the user.
- Products
- cyrus-imapd
- Affected versions
- 3.10.2-1, 3.10.2-1+deb13u1, 3.12.0-1, 3.12.0-2, 3.12.1-1, 3.12.1-2, 3.12.1-3, 3.12.2-1, 3.12.3-1~bpo13+1, 3.6.1-4, 3.6.1-4+deb12u1, 3.6.1-4+deb12u2, 3.6.1-4+deb12u3, 3.6.1-4+deb12u4
- Fixed versions
- 3.10.2-1+deb13u2, 3.12.3-1, 3.6.1-4+deb12u5
- CVEs
- CVE-2026-47088
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:52 UTC · Revision 2
Source evidence
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is heap exposure in nested MIME comment parsing. An authenticated IMAP user could craft an email message containing an RFC 822 comment ending with a backslash. When parsing the message, the server would read past the message's end in memory, and read into the heap, returning the read content to the user.
osv:DEBIAN-CVE-2026-47088
cyrus-imapd
Fixed versions: 3.6.1-4+deb12u5
cyrus-imapd
Fixed versions: 3.10.2-1+deb13u2
cyrus-imapd
Fixed versions: 3.12.3-1
Complete source record
{
"id": "18a1679d43e1803a72d75cf49c9f8b6074f3decb733d3573733f2319f0d2a04f",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-47088",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-47088",
"summary": "An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is heap exposure in nested MIME comment parsing. An authenticated IMAP user could craft an email message containing an RFC 822 comment ending with a backslash. When parsing the message, the server would read past the message's end in memory, and read into the heap, returning the read content to the user.",
"evidence": "osv:DEBIAN-CVE-2026-47088",
"products": [
{
"name": {
"value": "cyrus-imapd",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.1-4+deb12u5",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "3.6.1-4",
"evidence": "/affected/0/versions"
},
{
"value": "3.6.1-4+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.6.1-4+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.6.1-4+deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "3.6.1-4+deb12u4",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "cyrus-imapd",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.10.2-1+deb13u2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "3.10.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.10.2-1+deb13u1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "cyrus-imapd",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.12.3-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "3.10.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.12.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.12.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.12.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.12.1-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.12.1-3",
"evidence": "/affected/2/versions"
},
{
"value": "3.12.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.12.3-1~bpo13+1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "low",
"structured": {
"id": "DEBIAN-CVE-2026-47088",
"aliases": [
"DEBIAN-CVE-2026-47088"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.1-4+deb12u5"
}
]
}
],
"package": {
"name": "cyrus-imapd",
"purl": "pkg:deb/debian/cyrus-imapd?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.6.1-4",
"3.6.1-4+deb12u1",
"3.6.1-4+deb12u2",
"3.6.1-4+deb12u3",
"3.6.1-4+deb12u4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47088.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.10.2-1+deb13u2"
}
]
}
],
"package": {
"name": "cyrus-imapd",
"purl": "pkg:deb/debian/cyrus-imapd?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.10.2-1",
"3.10.2-1+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47088.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.12.3-1"
}
]
}
],
"package": {
"name": "cyrus-imapd",
"purl": "pkg:deb/debian/cyrus-imapd?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.10.2-1",
"3.12.0-1",
"3.12.0-2",
"3.12.1-1",
"3.12.1-2",
"3.12.1-3",
"3.12.2-1",
"3.12.3-1~bpo13+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47088.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-25T09:47:29.216545215Z",
"provider": "osv",
"upstream": [
"CVE-2026-47088"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-47088"
]
},
"related_cves": [
{
"value": "CVE-2026-47088",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 445114,
"published_at": "2026-07-16T19:16:49.513+00:00"
}