Description
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.
Published: 2026-09-07
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

Tracking

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Advisories

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History

Tue, 08 Sep 2026 05:30:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:8 cpe:/a:redhat:enterprise_linux:8::appstream
References

Tue, 08 Sep 2026 04:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat enterprise Linux Eus
Redhat rhel Eus
CPEs cpe:/a:redhat:rhel_eus:9.6::appstream
cpe:/a:redhat:rhel_eus:9.6::crb
cpe:/o:redhat:enterprise_linux_eus:10.0
Vendors & Products Redhat enterprise Linux Eus
Redhat rhel Eus
References

Tue, 08 Sep 2026 03:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat directory Server E4s
Redhat rhel Aus
Redhat rhel E4s
Redhat rhel Eus Long Life
Redhat rhel Tus
CPEs cpe:/a:redhat:directory_server_e4s:11.7::el8
cpe:/a:redhat:directory_server_e4s:12.2::el9
cpe:/a:redhat:rhel_aus:8.4::appstream
cpe:/a:redhat:rhel_e4s:8.8::appstream
cpe:/a:redhat:rhel_e4s:9.2::appstream
cpe:/a:redhat:rhel_e4s:9.4::appstream
cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
cpe:/a:redhat:rhel_tus:8.8::appstream
Vendors & Products Redhat directory Server E4s
Redhat rhel Aus
Redhat rhel E4s
Redhat rhel Eus Long Life
Redhat rhel Tus
References

Tue, 08 Sep 2026 02:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat rhel Els
CPEs cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat rhel Els
References

Tue, 08 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Mon, 07 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Description 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.
Title 389-ds-base: 389-ds-base: pre-authentication null pointer dereference via paged results and use_one_backend control in op_shared_search
First Time appeared Redhat
Redhat directory Server
Redhat enterprise Linux
Weaknesses CWE-476
CPEs cpe:/a:redhat:directory_server:11
cpe:/a:redhat:directory_server:12
cpe:/a:redhat:directory_server:13
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat directory Server
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Redhat Directory Server Directory Server E4s Enterprise Linux Enterprise Linux Eus Rhel Aus Rhel E4s Rhel Els Rhel Eus Rhel Eus Long Life Rhel Tus
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-08T05:17:28.333Z

Reserved: 2026-07-31T06:49:45.234Z

Link: CVE-2026-18453

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-07T15:17:31.017

Modified: 2026-09-08T05:16:47.850

Link: CVE-2026-18453

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-07T09:00:00Z

Links: CVE-2026-18453 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-07T15:45:17Z

Weaknesses