High
389-ds-base — security advisory
A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.
- Products
- 389-ds-base
- Affected versions
- 2.3.1+dfsg1-1, 2.3.1+dfsg1-1+deb12u1, 2.3.4+dfsg1-1, 2.3.4+dfsg1-1.1, 2.4.4+dfsg1-1, 2.4.4+dfsg1-3, 2.4.5+dfsg1-1, 3.0.2+dfsg1-1, 3.1.1+dfsg1-1, 3.1.1+dfsg1-2, 3.1.1+dfsg1-3, 3.1.2+dfsg1-1, 3.1.2+dfsg1-1+deb13u1, 3.1.2+vendor1-1, 3.1.2+vendor1-2, 3.3.0-1, 3.3.0-2, 3.3.1-1, 3.3.1-3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-18453
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 11:06 UTC · Revision 1
Source evidence
A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.
osv:DEBIAN-CVE-2026-18453
389-ds-base
Fixed versions: Not specified
389-ds-base
Fixed versions: Not specified
Complete source record
{
"id": "7c4842f58006537dbe3a09551549b573615b27448c06a7fe4ba5986a9dc6c662",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-18453",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-18453",
"summary": "A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.",
"evidence": "osv:DEBIAN-CVE-2026-18453",
"products": [
{
"name": {
"value": "389-ds-base",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.3.1+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.3.1+dfsg1-1+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2.3.4+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.3.4+dfsg1-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.4+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.4+dfsg1-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.4.5+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.2+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.1+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.1+dfsg1-2",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.1+dfsg1-3",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2+dfsg1-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2+vendor1-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.1.2+vendor1-2",
"evidence": "/affected/0/versions"
},
{
"value": "3.3.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.3.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "3.3.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.3.1-3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "389-ds-base",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.1.2+dfsg1-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.1.2+dfsg1-1+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "3.1.2+vendor1-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.1.2+vendor1-2",
"evidence": "/affected/1/versions"
},
{
"value": "3.3.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.3.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "3.3.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.3.1-3",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-18453",
"aliases": [
"DEBIAN-CVE-2026-18453"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "389-ds-base",
"purl": "pkg:deb/debian/389-ds-base?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.3.1+dfsg1-1",
"2.3.1+dfsg1-1+deb12u1",
"2.3.4+dfsg1-1",
"2.3.4+dfsg1-1.1",
"2.4.4+dfsg1-1",
"2.4.4+dfsg1-3",
"2.4.5+dfsg1-1",
"3.0.2+dfsg1-1",
"3.1.1+dfsg1-1",
"3.1.1+dfsg1-2",
"3.1.1+dfsg1-3",
"3.1.2+dfsg1-1",
"3.1.2+vendor1-1",
"3.1.2+vendor1-2",
"3.3.0-1",
"3.3.0-2",
"3.3.1-1",
"3.3.1-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18453.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "389-ds-base",
"purl": "pkg:deb/debian/389-ds-base?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.1.2+dfsg1-1",
"3.1.2+dfsg1-1+deb13u1",
"3.1.2+vendor1-1",
"3.1.2+vendor1-2",
"3.3.0-1",
"3.3.0-2",
"3.3.1-1",
"3.3.1-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18453.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-09T09:47:22.201282394Z",
"provider": "osv",
"upstream": [
"CVE-2026-18453"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-18453"
]
},
"related_cves": [
{
"value": "CVE-2026-18453",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 111408,
"published_at": "2026-09-07T15:17:31.017+00:00"
}