High 7.5Published Sep 7, 2026

CVE-2026-18453389-ds-base: 389-ds-base: pre-authentication null pointer dereference via paged results and use_one_backend control in op_shared_search

Updated under an hour ago (Oct 27, 2026, 3:40 PM ET)

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It affects Red Hat Directory Server 11.5 E4S for RHEL 8 and 9 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Red Hat Directory Server 11.5 E4S for RHEL 8

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Awaiting Analysis
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8 redhat:directory_server_e4s	from 8060020260908152739.0ca98e7e not affected	CNA record
Red Hat Red Hat Directory Server 11.9 for RHEL 8 redhat:directory_server	from 8100020260904171440.37ed7c03 not affected	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:3.2.0-10.el10_2 not affected	CNA record
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 0:3.0.6-21.el10_0 not affected	CNA record
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_els	from 0:1.3.11.1-15.el7_9 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_aus	from 8040020260901171549.96015a92 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_eus_long_life	from 8040020260901171549.96015a92 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service redhat:rhel_e4s	from 8080020260831180218.6dbb3803 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service redhat:rhel_tus	from 8080020260831180218.6dbb3803 not affected	CNA record
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus	from 0:2.6.1-24.el9_6 not affected	CNA record

References

References

https://access.redhat.com/errata/RHSA-2026:64771	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:64776	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:64778	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:64779	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:64780	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:64781	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:64783	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:64784	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:64785	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:64789	vendor-advisory, x-refsource-redhat
1–10 of 19

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.