UnratedFix available
dovecot: Fix of 2 CVEs
Type: advisorySources: OSV
- CVE-2026-27858: bound managesieve-login AUTHENTICATE initial response size to prevent memory exhaustion DoS before authentication - CVE-2025-59032: fix managesieve-login crash when AUTHENTICATE command did not finish on the first call due to literal SASL initial response
- Products
- dovecot, dovecot-devel, dovecot-mysql, dovecot-pgsql, dovecot-pigeonhole
- Affected versions
- Not specified
- Fixed versions
- 1:2.3.16-8.el9.tuxcare.els4
- CVEs
- CVE-2025-59032, CVE-2026-27858
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 13:49 UTC · Revision 1
Source evidence
- CVE-2026-27858: bound managesieve-login AUTHENTICATE initial response size to prevent memory exhaustion DoS before authentication - CVE-2025-59032: fix managesieve-login crash when AUTHENTICATE command did not finish on the first call due to literal SASL initial response
osv:CLSA-2026-1778255734
dovecot
Fixed versions: 1:2.3.16-8.el9.tuxcare.els4
dovecot-devel
Fixed versions: 1:2.3.16-8.el9.tuxcare.els4
dovecot-mysql
Fixed versions: 1:2.3.16-8.el9.tuxcare.els4
dovecot-pgsql
Fixed versions: 1:2.3.16-8.el9.tuxcare.els4
dovecot-pigeonhole
Fixed versions: 1:2.3.16-8.el9.tuxcare.els4
Complete source record
{
"id": "8c22583ee26e4230c56c34382f92aa5589946d7cdc49a114cbeec0dfbac057cb",
"url": "https://osv.dev/vulnerability/CLSA-2026-1778255734",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "dovecot: Fix of 2 CVEs",
"summary": "- CVE-2026-27858: bound managesieve-login AUTHENTICATE initial response size to prevent memory exhaustion DoS before authentication - CVE-2025-59032: fix managesieve-login crash when AUTHENTICATE command did not finish on the first call due to literal SASL initial response",
"evidence": "osv:CLSA-2026-1778255734",
"products": [
{
"name": {
"value": "dovecot",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.3.16-8.el9.tuxcare.els4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot-devel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.3.16-8.el9.tuxcare.els4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot-mysql",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.3.16-8.el9.tuxcare.els4",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot-pgsql",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.3.16-8.el9.tuxcare.els4",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot-pigeonhole",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.3.16-8.el9.tuxcare.els4",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1778255734",
"aliases": [
"CLSA-2026-1778255734"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.3.16-8.el9.tuxcare.els4"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:rpm/tuxcare/dovecot?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1778255734.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.3.16-8.el9.tuxcare.els4"
}
]
}
],
"package": {
"name": "dovecot-devel",
"purl": "pkg:rpm/tuxcare/dovecot-devel?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1778255734.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.3.16-8.el9.tuxcare.els4"
}
]
}
],
"package": {
"name": "dovecot-mysql",
"purl": "pkg:rpm/tuxcare/dovecot-mysql?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1778255734.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.3.16-8.el9.tuxcare.els4"
}
]
}
],
"package": {
"name": "dovecot-pgsql",
"purl": "pkg:rpm/tuxcare/dovecot-pgsql?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1778255734.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.3.16-8.el9.tuxcare.els4"
}
]
}
],
"package": {
"name": "dovecot-pigeonhole",
"purl": "pkg:rpm/tuxcare/dovecot-pigeonhole?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1778255734.json"
}
}
],
"modified": "2026-10-21T10:45:35.620509851Z",
"provider": "osv",
"upstream": [
"CVE-2025-59032",
"CVE-2026-27858"
],
"references": [
"https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1778255734.html"
]
},
"related_cves": [
{
"value": "CVE-2025-59032",
"evidence": "/upstream"
},
{
"value": "CVE-2026-27858",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 392154,
"published_at": "2026-05-08T21:08:31+00:00"
}