CVE-2026-18453
389-ds-base: 389-ds-base: pre-authentication null pointer dereference via paged results and use_one_backend control in op_shared_search
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-476 |
| Vendor | red hat |
| Product | red hat directory server 11.7 e4s for rhel 8 |
| Published | Sep 7, 2026 |
| Last Updated | Sep 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat Directory Server 11.7 E4S for RHEL 8
All versions affected Red Hat / Red Hat Directory Server 11.9 for RHEL 8
All versions affected Red Hat / Red Hat Directory Server 12.2 E4S for RHEL 9
All versions affected Red Hat / Red Hat Directory Server 12.4 E4S for RHEL 9
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support
All versions affected Red Hat / Red Hat Directory Server 13.2
All versions affected Red Hat / Red Hat Directory Server 12
All versions affected Red Hat / Red Hat Directory Server 13
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64771 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64776 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64778 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64779 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64780 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64781 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64783 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64784 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64785 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64789 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64790 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64791 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64792 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64793 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:64804 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:65119 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-18453 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2509696
Credits
Red Hat would like to thank Arthur Chan (Ada Logics) and Team (Anthropic) for reporting this issue.