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

State: Published
Severity: 7.5 High
Published: Sep 7, 2026
Updated: Oct 8, 2026
Reserved: Jul 31, 2026

Read the record on cve.org

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
Red Hat Directory Server 11.5 E4S for RHEL 8Red Hat	8060020260908152739.0ca98e7e and laterNot affected
Red Hat Directory Server 11.7 E4S for RHEL 8Red Hat	8080020260903102346.f969626e and laterNot affected
Red Hat Directory Server 11.9 for RHEL 8Red Hat	8100020260904171440.37ed7c03 and laterNot affected
Red Hat Directory Server 12.2 E4S for RHEL 9Red Hat	9020020260903155914.1674d574 and laterNot affected
Red Hat Directory Server 12.4 E4S for RHEL 9Red Hat	9040020260903102623.1674d574 and laterNot affected
Red Hat Enterprise Linux 10Red Hat	0:3.2.0-10.el10_2 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:3.0.6-21.el10_0 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.3.11.1-15.el7_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	8100020260904155442.25e700aa and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	8040020260901171549.96015a92 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	8040020260901171549.96015a92 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	8060020260901145727.824efc52 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	8060020260901145727.824efc52 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	8080020260831180218.6dbb3803 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	8080020260831180218.6dbb3803 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.8.0-10.el9_8 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:2.2.4-22.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:2.4.5-29.el9_4 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:2.6.1-24.el9_6 and laterNot affected
Red Hat Directory Server 13.2Red Hat	1788851765 and laterNot affected
Red Hat Directory Server 12Red Hat
Red Hat Directory Server 13Red Hat
Red Hat Enterprise Linux 6Red Hat

References

RHSA-2026:64771vendor-advisory
RHSA-2026:64776vendor-advisory
RHSA-2026:64778vendor-advisory
RHSA-2026:64779vendor-advisory
RHSA-2026:64780vendor-advisory
RHSA-2026:64781vendor-advisory
RHSA-2026:64783vendor-advisory
RHSA-2026:64784vendor-advisory
RHSA-2026:64785vendor-advisory
RHSA-2026:64789vendor-advisory
RHSA-2026:64790vendor-advisory
RHSA-2026:64791vendor-advisory
RHSA-2026:64792vendor-advisory
RHSA-2026:64793vendor-advisory
RHSA-2026:64804vendor-advisory
RHSA-2026:65119vendor-advisory
RHSA-2026:79217vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-18453vdb-entry
RHBZ#2509696issue-tracking

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