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 | CVE-2026-18453 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-07 15:17:31 UTC |
| Updated | 2026-09-08 08:17:10 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Problem Types: CWE-476 | CWE-476 NULL Pointer Dereference
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Directory Server 11.7 E4S For RHEL 8 | unaffected 8080020260903102346.f969626e * rpm | Not specified |
| CNA | Red Hat | Red Hat Directory Server 11.9 For RHEL 8 | unaffected 8100020260904171440.37ed7c03 * rpm | Not specified |
| CNA | Red Hat | Red Hat Directory Server 12.2 E4S For RHEL 9 | unaffected 9020020260903155914.1674d574 * rpm | Not specified |
| CNA | Red Hat | Red Hat Directory Server 12.4 E4S For RHEL 9 | unaffected 9040020260903102623.1674d574 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:3.2.0-10.el10_2 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | unaffected 0:3.0.6-21.el10_0 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | unaffected 0:1.3.11.1-15.el7_9 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 8100020260904155442.25e700aa * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 8040020260901171549.96015a92 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | unaffected 8040020260901171549.96015a92 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 8060020260901145727.824efc52 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | unaffected 8060020260901145727.824efc52 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 8080020260831180218.6dbb3803 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions | unaffected 8080020260831180218.6dbb3803 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:2.8.0-10.el9_8 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions | unaffected 0:2.2.4-22.el9_2 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.4 Update Services For SAP Solutions | unaffected 0:2.4.5-29.el9_4 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 0:2.6.1-24.el9_6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Directory Server 12 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Directory Server 13 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:64781 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64778 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64779 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64780 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64783 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64776 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64784 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64793 | [email protected] | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64771 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64792 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64804 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64785 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64789 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64791 | [email protected] | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-18453 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:64790 | [email protected] | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Red Hat would like to thank Arthur Chan (Ada Logics) and Team (Anthropic) for reporting this issue. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-07-08T00:00:00.000Z | Reported to Red Hat. |
| CNA | 2026-09-07T09:00:00.000Z | Made public. |
Workarounds
CNA: 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.
There are currently no legacy QID mappings associated with this CVE.