Vulnerability Intelligence Report
389-ds-base: 389-ds-base: pre-authentication null pointer dereference via paged results and use_one_backend control in op_shared_search
CVE-2026-18453
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.
No Active Exploit Signals
CVSS Base Score
7.5
HIGH
Exploitability:3.9
Impact Score:3.6
EPSS Probability:0.85%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-476 ↗NULL Pointer Dereference
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Red Hat | Red Hat Directory Server 11.7 E4S for RHEL 8 | 8080020260903102346.f969626e < * (unaffected) |
| Red Hat | Red Hat Directory Server 11.9 for RHEL 8 | 8100020260904171440.37ed7c03 < * (unaffected) |
| Red Hat | Red Hat Directory Server 12.2 E4S for RHEL 9 | 9020020260903155914.1674d574 < * (unaffected) |
| Red Hat | Red Hat Directory Server 12.4 E4S for RHEL 9 | 9040020260903102623.1674d574 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 10 | 0:3.2.0-10.el10_2 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | 0:3.0.6-21.el10_0 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:1.3.11.1-15.el7_9 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8 | 8100020260904155442.25e700aa < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 8040020260901171549.96015a92 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 8040020260901171549.96015a92 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 8060020260901145727.824efc52 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | 8060020260901145727.824efc52 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 8080020260831180218.6dbb3803 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 8080020260831180218.6dbb3803 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9 | 0:2.8.0-10.el9_8 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | 0:2.2.4-22.el9_2 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | 0:2.4.5-29.el9_4 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | 0:2.6.1-24.el9_6 < * (unaffected) |
| Red Hat | Red Hat Directory Server 13.2 | 1788851765 < * (unaffected) |
| Red Hat | Red Hat Directory Server 12 | all |
| Red Hat | Red Hat Directory Server 13 | all |
| Red Hat | Red Hat Enterprise Linux 6 | all |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.847%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Red Hat, Inc. · Vendor · USA |
| Reserved | 2026-07-31T06:49:45 |
| Published | 2026-09-07T14:14:48 |
| Patch Date | 2026-09-07 |
| Last Updated | 2026-09-09T14:40:15 |
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