UnratedFix available
dovecot: Fix of 2 CVEs
Type: advisorySources: OSV
- CVE-2026-42006: lib-imap: fix list_count_limit to actually count open '(' instead of close ')', preventing an imap-login memory-exhaustion DoS that bypassed the CVE-2026-27857 fix
- Products
- dovecot, dovecot-devel, dovecot-mysql, dovecot-pgsql, dovecot-pigeonhole
- Affected versions
- Not specified
- Fixed versions
- 1:2.0.9-23.el6.tuxcare.els5
- CVEs
- CVE-2026-27857, CVE-2026-42006
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 14:06 UTC · Revision 1
Source evidence
- CVE-2026-42006: lib-imap: fix list_count_limit to actually count open '(' instead of close ')', preventing an imap-login memory-exhaustion DoS that bypassed the CVE-2026-27857 fix
osv:CLSA-2026-1779378574
dovecot
Fixed versions: 1:2.0.9-23.el6.tuxcare.els5
dovecot-devel
Fixed versions: 1:2.0.9-23.el6.tuxcare.els5
dovecot-mysql
Fixed versions: 1:2.0.9-23.el6.tuxcare.els5
dovecot-pgsql
Fixed versions: 1:2.0.9-23.el6.tuxcare.els5
dovecot-pigeonhole
Fixed versions: 1:2.0.9-23.el6.tuxcare.els5
Complete source record
{
"id": "23dd6aaafb0b2e4c0f7af4db57f0cdb494fae97f8ab4b6de3fca63bdd20cd795",
"url": "https://osv.dev/vulnerability/CLSA-2026-1779378574",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "dovecot: Fix of 2 CVEs",
"summary": "- CVE-2026-42006: lib-imap: fix list_count_limit to actually count open '(' instead of close ')', preventing an imap-login memory-exhaustion DoS that bypassed the CVE-2026-27857 fix",
"evidence": "osv:CLSA-2026-1779378574",
"products": [
{
"name": {
"value": "dovecot",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.0.9-23.el6.tuxcare.els5",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot-devel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.0.9-23.el6.tuxcare.els5",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot-mysql",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.0.9-23.el6.tuxcare.els5",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot-pgsql",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.0.9-23.el6.tuxcare.els5",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot-pigeonhole",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:2.0.9-23.el6.tuxcare.els5",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1779378574",
"aliases": [
"CLSA-2026-1779378574"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.0.9-23.el6.tuxcare.els5"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:rpm/tuxcare/dovecot?distro=oraclelinux-6",
"ecosystem": "TuxCare:OracleLinux:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux6els/CLSA-2026-1779378574.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.0.9-23.el6.tuxcare.els5"
}
]
}
],
"package": {
"name": "dovecot-devel",
"purl": "pkg:rpm/tuxcare/dovecot-devel?distro=oraclelinux-6",
"ecosystem": "TuxCare:OracleLinux:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux6els/CLSA-2026-1779378574.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.0.9-23.el6.tuxcare.els5"
}
]
}
],
"package": {
"name": "dovecot-mysql",
"purl": "pkg:rpm/tuxcare/dovecot-mysql?distro=oraclelinux-6",
"ecosystem": "TuxCare:OracleLinux:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux6els/CLSA-2026-1779378574.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.0.9-23.el6.tuxcare.els5"
}
]
}
],
"package": {
"name": "dovecot-pgsql",
"purl": "pkg:rpm/tuxcare/dovecot-pgsql?distro=oraclelinux-6",
"ecosystem": "TuxCare:OracleLinux:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux6els/CLSA-2026-1779378574.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.0.9-23.el6.tuxcare.els5"
}
]
}
],
"package": {
"name": "dovecot-pigeonhole",
"purl": "pkg:rpm/tuxcare/dovecot-pigeonhole?distro=oraclelinux-6",
"ecosystem": "TuxCare:OracleLinux:6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux6els/CLSA-2026-1779378574.json"
}
}
],
"modified": "2026-10-21T10:48:09.200480911Z",
"provider": "osv",
"upstream": [
"CVE-2026-27857",
"CVE-2026-42006"
],
"references": [
"https://errata.tuxcare.com/els_os/oraclelinux6els/CLSA-2026-1779378574.html"
]
},
"related_cves": [
{
"value": "CVE-2026-27857",
"evidence": "/upstream"
},
{
"value": "CVE-2026-42006",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 392839,
"published_at": "2026-05-21T15:49:38+00:00"
}