CVE-2026-18453
HIGHCVSS 7.5/10EPSS 0.85%
Last modified
CVE-2026-18453 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.85% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Directory Server 11.7 E4S for RHEL 8 | All versions |
| Red Hat | Red Hat Directory Server 11.9 for RHEL 8 | All versions |
| Red Hat | Red Hat Directory Server 12.2 E4S for RHEL 9 | All versions |
| Red Hat | Red Hat Directory Server 12.4 E4S for RHEL 9 | All versions |
| Red Hat | Red Hat Enterprise Linux 10 | All versions |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | All versions |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | All versions |
| Red Hat | Red Hat Enterprise Linux 8 | All versions |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | All versions |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | All versions |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | All versions |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | All versions |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | All versions |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | All versions |
| Red Hat | Red Hat Enterprise Linux 9 | All versions |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | All versions |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | All versions |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | All versions |
| Red Hat | Red Hat Directory Server 13.2 | All versions |
| Red Hat | Red Hat Directory Server 12 | All versions |
| Red Hat | Red Hat Enterprise Linux 6 | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is 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.
How severe is CVE-2026-18453?
CVE-2026-18453 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.
How do I fix CVE-2026-18453?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-18453?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST