High
389-ds-base — security advisory
A flaw was found in 389-ds-base. An unauthenticated remote attacker can send a complete LDAP operation followed by the first bytes of an incomplete LDAPMessage on the same connection, causing the server to hand that connection to a second worker thread before the first worker's result is flushed. The second worker blocks until nsslapd-ioblocktimeout while holding the connection mutex, preventing delivery of the completed operation's result. Repeating this across a small number of connections proportional to the configured worker-thread pool size exhausts the entire pool under default configuration, denying service to all clients (anonymous and authenticated, plaintext and TLS) for as long as the attacker maintains the connections.
- Products
- 389-ds-base
- Affected versions
- 1.3.3.12-1build1, 1.3.3.13-1, 1.3.4.5-2, 1.3.4.8-1, 1.3.4.8-3, 1.3.4.8-3ubuntu1, 1.3.4.8-4, 1.3.4.9-1, 1.3.4.9-1ubuntu0.1~esm1, 1.3.7.10-1, 1.3.7.10-1ubuntu1, 1.3.7.10-1ubuntu1+esm1, 1.3.7.5-1, 1.3.7.5-1build1, 1.3.7.5-1build2, 1.3.7.9-1, 1.4.1.6-4, 1.4.1.6-4build1, 1.4.2.4-1, 1.4.2.4-1build1, 1.4.3.2-1, 1.4.3.2-1build1, 1.4.3.6-2, 1.4.3.6-2ubuntu0.1~esm1, 1.4.4.11-2build1, 1.4.4.11-2build2, 1.4.4.17-1, 2.0.11-2, 2.0.14-1, 2.0.15-1, 2.0.15-1ubuntu2, 2.3.4+dfsg1-1, 2.4.4+dfsg1-1ubuntu1, 2.4.4+dfsg1-1ubuntu4, 2.4.4+dfsg1-3, 2.4.5+dfsg1-1, 3.1.2+dfsg1-1, 3.1.2+vendor1-2, 3.1.2+vendor1-2build1, 3.3.1-3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-86344
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:24 UTC · Revision 1
Source evidence
A flaw was found in 389-ds-base. An unauthenticated remote attacker can send a complete LDAP operation followed by the first bytes of an incomplete LDAPMessage on the same connection, causing the server to hand that connection to a second worker thread before the first worker's result is flushed. The second worker blocks until nsslapd-ioblocktimeout while holding the connection mutex, preventing delivery of the completed operation's result. Repeating this across a small number of connections proportional to the configured worker-thread pool size exhausts the entire pool under default configuration, denying service to all clients (anonymous and authenticated, plaintext and TLS) for as long as the attacker maintains the connections.
osv:UBUNTU-CVE-2026-86344
389-ds-base
Fixed versions: Not specified
389-ds-base
Fixed versions: Not specified
389-ds-base
Fixed versions: Not specified
389-ds-base
Fixed versions: Not specified
389-ds-base
Fixed versions: Not specified
389-ds-base
Fixed versions: Not specified
389-ds-base
Fixed versions: Not specified
Complete source record
{
"id": "6bde3dbdf94cbae919e25f3e0353ac195d3eadbda45f8aabc14db43f5267b724",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-86344",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-86344",
"summary": "A flaw was found in 389-ds-base. An unauthenticated remote attacker can send a complete LDAP operation followed by the first bytes of an incomplete LDAPMessage on the same connection, causing the server to hand that connection to a second worker thread before the first worker's result is flushed. The second worker blocks until nsslapd-ioblocktimeout while holding the connection mutex, preventing delivery of the completed operation's result. Repeating this across a small number of connections proportional to the configured worker-thread pool size exhausts the entire pool under default configuration, denying service to all clients (anonymous and authenticated, plaintext and TLS) for as long as the attacker maintains the connections.",
"evidence": "osv:UBUNTU-CVE-2026-86344",
"products": [
{
"name": {
"value": "389-ds-base",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.3.12-1build1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.3.13-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.4.5-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.4.8-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.4.8-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.4.8-3ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.4.8-4",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.4.9-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.3.4.9-1ubuntu0.1~esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "389-ds-base",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.7.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.7.5-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.7.5-1build2",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.7.9-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.7.10-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.7.10-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.7.10-1ubuntu1+esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "389-ds-base",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.1.6-4",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.1.6-4build1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.2.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.2.4-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3.2-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3.6-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.4.3.6-2ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "389-ds-base",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.4.11-2build1",
"evidence": "/affected/3/versions"
},
{
"value": "1.4.4.11-2build2",
"evidence": "/affected/3/versions"
},
{
"value": "1.4.4.17-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.0.11-2",
"evidence": "/affected/3/versions"
},
{
"value": "2.0.14-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.0.15-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.0.15-1ubuntu2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "389-ds-base",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.3.4+dfsg1-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.4.4+dfsg1-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "2.4.4+dfsg1-1ubuntu4",
"evidence": "/affected/4/versions"
},
{
"value": "2.4.4+dfsg1-3",
"evidence": "/affected/4/versions"
},
{
"value": "2.4.5+dfsg1-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "389-ds-base",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.1.2+vendor1-2",
"evidence": "/affected/5/versions"
},
{
"value": "3.1.2+vendor1-2build1",
"evidence": "/affected/5/versions"
},
{
"value": "3.3.1-3",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "389-ds-base",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.1.2+dfsg1-1",
"evidence": "/affected/6/versions"
},
{
"value": "3.1.2+vendor1-2",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-86344",
"aliases": [
"UBUNTU-CVE-2026-86344"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "389-ds-base",
"purl": "pkg:deb/ubuntu/389-ds-base?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1.3.3.12-1build1",
"1.3.3.13-1",
"1.3.4.5-2",
"1.3.4.8-1",
"1.3.4.8-3",
"1.3.4.8-3ubuntu1",
"1.3.4.8-4",
"1.3.4.9-1",
"1.3.4.9-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86344.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "389-ds",
"binary_version": "1.3.4.9-1ubuntu0.1~esm1"
},
{
"binary_name": "389-ds-base",
"binary_version": "1.3.4.9-1ubuntu0.1~esm1"
},
{
"binary_name": "389-ds-base-libs",
"binary_version": "1.3.4.9-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "389-ds-base",
"purl": "pkg:deb/ubuntu/389-ds-base?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1.3.7.5-1",
"1.3.7.5-1build1",
"1.3.7.5-1build2",
"1.3.7.9-1",
"1.3.7.10-1",
"1.3.7.10-1ubuntu1",
"1.3.7.10-1ubuntu1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86344.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "389-ds",
"binary_version": "1.3.7.10-1ubuntu1+esm1"
},
{
"binary_name": "389-ds-base",
"binary_version": "1.3.7.10-1ubuntu1+esm1"
},
{
"binary_name": "389-ds-base-libs",
"binary_version": "1.3.7.10-1ubuntu1+esm1"
},
{
"binary_name": "python3-dirsrvtests",
"binary_version": "1.3.7.10-1ubuntu1+esm1"
},
{
"binary_name": "python3-lib389",
"binary_version": "1.3.7.10-1ubuntu1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "389-ds-base",
"purl": "pkg:deb/ubuntu/389-ds-base?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"1.4.1.6-4",
"1.4.1.6-4build1",
"1.4.2.4-1",
"1.4.2.4-1build1",
"1.4.3.2-1",
"1.4.3.2-1build1",
"1.4.3.6-2",
"1.4.3.6-2ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86344.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "389-ds",
"binary_version": "1.4.3.6-2ubuntu0.1~esm1"
},
{
"binary_name": "389-ds-base",
"binary_version": "1.4.3.6-2ubuntu0.1~esm1"
},
{
"binary_name": "389-ds-base-libs",
"binary_version": "1.4.3.6-2ubuntu0.1~esm1"
},
{
"binary_name": "cockpit-389-ds",
"binary_version": "1.4.3.6-2ubuntu0.1~esm1"
},
{
"binary_name": "python3-lib389",
"binary_version": "1.4.3.6-2ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "389-ds-base",
"purl": "pkg:deb/ubuntu/389-ds-base?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1.4.4.11-2build1",
"1.4.4.11-2build2",
"1.4.4.17-1",
"2.0.11-2",
"2.0.14-1",
"2.0.15-1",
"2.0.15-1ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86344.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "389-ds",
"binary_version": "2.0.15-1ubuntu2"
},
{
"binary_name": "389-ds-base",
"binary_version": "2.0.15-1ubuntu2"
},
{
"binary_name": "389-ds-base-libs",
"binary_version": "2.0.15-1ubuntu2"
},
{
"binary_name": "cockpit-389-ds",
"binary_version": "2.0.15-1ubuntu2"
},
{
"binary_name": "python3-lib389",
"binary_version": "2.0.15-1ubuntu2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "389-ds-base",
"purl": "pkg:deb/ubuntu/389-ds-base?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"2.3.4+dfsg1-1",
"2.4.4+dfsg1-1ubuntu1",
"2.4.4+dfsg1-1ubuntu4",
"2.4.4+dfsg1-3",
"2.4.5+dfsg1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86344.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "389-ds",
"binary_version": "2.4.5+dfsg1-1"
},
{
"binary_name": "389-ds-base",
"binary_version": "2.4.5+dfsg1-1"
},
{
"binary_name": "389-ds-base-libs",
"binary_version": "2.4.5+dfsg1-1"
},
{
"binary_name": "cockpit-389-ds",
"binary_version": "2.4.5+dfsg1-1"
},
{
"binary_name": "python3-lib389",
"binary_version": "2.4.5+dfsg1-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "389-ds-base",
"purl": "pkg:deb/ubuntu/389-ds-base?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"3.1.2+vendor1-2",
"3.1.2+vendor1-2build1",
"3.3.1-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86344.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "389-ds",
"binary_version": "3.3.1-3"
},
{
"binary_name": "389-ds-base",
"binary_version": "3.3.1-3"
},
{
"binary_name": "389-ds-base-libs",
"binary_version": "3.3.1-3"
},
{
"binary_name": "cockpit-389-ds",
"binary_version": "3.3.1-3"
},
{
"binary_name": "python3-lib389",
"binary_version": "3.3.1-3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "389-ds-base",
"purl": "pkg:deb/ubuntu/389-ds-base?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"3.1.2+dfsg1-1",
"3.1.2+vendor1-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86344.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "389-ds",
"binary_version": "3.1.2+vendor1-2"
},
{
"binary_name": "389-ds-base",
"binary_version": "3.1.2+vendor1-2"
},
{
"binary_name": "389-ds-base-libs",
"binary_version": "3.1.2+vendor1-2"
},
{
"binary_name": "cockpit-389-ds",
"binary_version": "3.1.2+vendor1-2"
},
{
"binary_name": "python3-lib389",
"binary_version": "3.1.2+vendor1-2"
}
]
}
}
],
"modified": "2026-10-17T13:01:13.698121928Z",
"provider": "osv",
"upstream": [
"CVE-2026-86344"
],
"references": [
"https://ubuntu.com/security/CVE-2026-86344",
"https://www.cve.org/CVERecord?id=CVE-2026-86344",
"https://bugzilla.redhat.com/show_bug.cgi?id=2529329",
"https://access.redhat.com/security/cve/CVE-2026-86344"
]
},
"related_cves": [
{
"value": "CVE-2026-86344",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361317,
"published_at": "2026-10-01T22:17:00+00:00"
}