Bug 2509696 (CVE-2026-18453) - 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
Summary: CVE-2026-18453 389-ds-base: 389-ds-base: pre-authentication NULL pointer dere...
Keywords:
Status: NEW
Alias: CVE-2026-18453
Deadline: 2026-09-07
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2529451
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-31 06:56 UTC by OSIDB Bzimport
Modified: 2026-09-08 05:44 UTC (History)
12 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:64771 0 None None None 2026-09-08 01:56:38 UTC
Red Hat Product Errata RHSA-2026:64776 0 None None None 2026-09-08 02:21:25 UTC
Red Hat Product Errata RHSA-2026:64778 0 None None None 2026-09-08 02:22:20 UTC
Red Hat Product Errata RHSA-2026:64779 0 None None None 2026-09-08 02:07:53 UTC
Red Hat Product Errata RHSA-2026:64780 0 None None None 2026-09-08 02:08:43 UTC
Red Hat Product Errata RHSA-2026:64781 0 None None None 2026-09-08 02:39:17 UTC
Red Hat Product Errata RHSA-2026:64783 0 None None None 2026-09-08 03:31:57 UTC
Red Hat Product Errata RHSA-2026:64784 0 None None None 2026-09-08 05:44:36 UTC
Red Hat Product Errata RHSA-2026:64785 0 None None None 2026-09-08 05:07:31 UTC
Red Hat Product Errata RHSA-2026:64789 0 None None None 2026-09-08 02:42:43 UTC
Red Hat Product Errata RHSA-2026:64790 0 None None None 2026-09-08 02:47:44 UTC
Red Hat Product Errata RHSA-2026:64791 0 None None None 2026-09-08 04:36:55 UTC
Red Hat Product Errata RHSA-2026:64792 0 None None None 2026-09-08 02:38:45 UTC
Red Hat Product Errata RHSA-2026:64793 0 None None None 2026-09-08 02:39:36 UTC
Red Hat Product Errata RHSA-2026:64804 0 None None None 2026-09-08 03:47:04 UTC

Description OSIDB Bzimport 2026-07-31 06:56:31 UTC 
A flaw was found in 389 Directory Server. The op_shared_search function in opshared.c does not check for a NULL backend pointer when reusing a paged-results slot in the be_name (USE_ONE_BACKEND control) code path. An unauthenticated client can exploit this by sending two SEARCH requests on the same connection: the first names a non-existent backend via the USE_ONE_BACKEND control with a Simple Paged Results (SPR) empty cookie, storing NULL as the backend in a paged-results slot; the second names a valid backend with an SPR cookie referencing that slot, causing the server to retrieve the stored NULL and call slapi_be_Rlock(NULL), which dereferences the NULL pointer and crashes the ns-slapd process. This is reachable pre-authentication because control and paged-results processing runs before search authorization. Paged results and anonymous access are both enabled by default.
Comment 1 errata-xmlrpc 2026-09-08 01:56:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:64771 https://access.redhat.com/errata/RHSA-2026:64771
Comment 2 errata-xmlrpc 2026-09-08 02:07:52 UTC 
This issue has been addressed in the following products:

  Red Hat Directory Server 12.2 E4S for RHEL 9

Via RHSA-2026:64779 https://access.redhat.com/errata/RHSA-2026:64779
Comment 3 errata-xmlrpc 2026-09-08 02:08:42 UTC 
This issue has been addressed in the following products:

  Red Hat Directory Server 12.4 E4S for RHEL 9

Via RHSA-2026:64780 https://access.redhat.com/errata/RHSA-2026:64780
Comment 4 errata-xmlrpc 2026-09-08 02:21:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:64776 https://access.redhat.com/errata/RHSA-2026:64776
Comment 5 errata-xmlrpc 2026-09-08 02:22:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:64778 https://access.redhat.com/errata/RHSA-2026:64778
Comment 6 errata-xmlrpc 2026-09-08 02:38:44 UTC 
This issue has been addressed in the following products:

  Red Hat Directory Server 11.7 E4S for RHEL 8

Via RHSA-2026:64792 https://access.redhat.com/errata/RHSA-2026:64792
Comment 7 errata-xmlrpc 2026-09-08 02:39:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:64781 https://access.redhat.com/errata/RHSA-2026:64781
Comment 8 errata-xmlrpc 2026-09-08 02:39:35 UTC 
This issue has been addressed in the following products:

  Red Hat Directory Server 11.9 for RHEL 8

Via RHSA-2026:64793 https://access.redhat.com/errata/RHSA-2026:64793
Comment 9 errata-xmlrpc 2026-09-08 02:42:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:64789 https://access.redhat.com/errata/RHSA-2026:64789
Comment 10 errata-xmlrpc 2026-09-08 02:47:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:64790 https://access.redhat.com/errata/RHSA-2026:64790
Comment 11 errata-xmlrpc 2026-09-08 03:31:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:64783 https://access.redhat.com/errata/RHSA-2026:64783
Comment 12 errata-xmlrpc 2026-09-08 03:47:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:64804 https://access.redhat.com/errata/RHSA-2026:64804
Comment 13 errata-xmlrpc 2026-09-08 04:36:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:64791 https://access.redhat.com/errata/RHSA-2026:64791
Comment 14 errata-xmlrpc 2026-09-08 05:07:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:64785 https://access.redhat.com/errata/RHSA-2026:64785
Comment 15 errata-xmlrpc 2026-09-08 05:44:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:64784 https://access.redhat.com/errata/RHSA-2026:64784
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