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VulnTideExploited vulnerabilities, by vendor. Data as of 29 Oct 2026.

Not in CISA KEVPublished 7 September 2026CVSS 7.5 highEPSS 0.8% probability of exploitation in 30 daysFound by AI: Anthropic (Claude)

Red Hat

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

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of 29 Oct 2026. If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?

0.8%

EPSS score, percentile 58 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

7.5 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (12)

Which versions are affected?

Unaffected 8060020260908152739.0ca98e7e; 8080020260903102346.f969626e; 8100020260904171440.37ed7c03; 9020020260903155914.1674d574; 9040020260903102623.1674d574; 0:3.2.0-10.el10_2; and 14 more

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; FIRST EPSS, as of 29 Oct 2026; CVE List, as of 29 Oct 2026. About the data.

What to do

Workaround (from the CVE record)

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.

Advisories and patches

RHSA-2026:64771 (Vendor advisory)
RHSA-2026:64776 (Vendor advisory)
RHSA-2026:64778 (Vendor advisory)
RHSA-2026:64779 (Vendor advisory)
RHSA-2026:64780 (Vendor advisory)
RHSA-2026:64781 (Vendor advisory)
RHSA-2026:64783 (Vendor advisory)
RHSA-2026:64784 (Vendor advisory)
RHSA-2026:64785 (Vendor advisory)
RHSA-2026:64789 (Vendor advisory)
RHSA-2026:64790 (Vendor advisory)
RHSA-2026:64791 (Vendor advisory)

This summary is based on the CVE record as of 29 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

As listed in the CVE record.

Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8
Status	Versions
Unaffected	8060020260908152739.0ca98e7e

Versions not listed are: affected.

Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8
Status	Versions
Unaffected	8080020260903102346.f969626e

Versions not listed are: affected.

Red Hat Red Hat Directory Server 11.9 for RHEL 8
Status	Versions
Unaffected	8100020260904171440.37ed7c03

Versions not listed are: affected.

Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9
Status	Versions
Unaffected	9020020260903155914.1674d574

Versions not listed are: affected.

Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9
Status	Versions
Unaffected	9040020260903102623.1674d574

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 10
Status	Versions
Unaffected	0:3.2.0-10.el10_2

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
Status	Versions
Unaffected	0:3.0.6-21.el10_0

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
Status	Versions
Unaffected	0:1.3.11.1-15.el7_9

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8
Status	Versions
Unaffected	8100020260904155442.25e700aa

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Status	Versions
Unaffected	8040020260901171549.96015a92

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Status	Versions
Unaffected	8040020260901171549.96015a92

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Status	Versions
Unaffected	8060020260901145727.824efc52

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
Status	Versions
Unaffected	8060020260901145727.824efc52

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Status	Versions
Unaffected	8080020260831180218.6dbb3803

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Status	Versions
Unaffected	8080020260831180218.6dbb3803

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9
Status	Versions
Unaffected	0:2.8.0-10.el9_8

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Status	Versions
Unaffected	0:2.2.4-22.el9_2

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
Status	Versions
Unaffected	0:2.4.5-29.el9_4

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
Status	Versions
Unaffected	0:2.6.1-24.el9_6

Versions not listed are: affected.

Red Hat Red Hat Directory Server 13.2
Status	Versions
Unaffected	1788851765

Versions not listed are: affected.

Versions the record lists as unaffected: 8060020260908152739.0ca98e7e, 8080020260903102346.f969626e, 8100020260904171440.37ed7c03, 9020020260903155914.1674d574, 9040020260903102623.1674d574, 0:3.2.0-10.el10_2, 0:3.0.6-21.el10_0, 0:1.3.11.1-15.el7_9.

Source: CVE List, as of 29 Oct 2026. About the data.

About this vulnerability

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.

Summary: CVE record, as of 29 Oct 2026.

CISA has not added CVE-2026-18453 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
The CVE record was published on 7 Sep 2026.
The CVE record carries a CVSS v3.1 base score of 7.5 (High), given by its CNA.
FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.8% (percentile 58), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
CISA's SSVC assessment in the CVE record: exploitation none, automatable yes, technical impact partial.
The credits in the CVE record name Anthropic (Claude) as finder.

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; CVE List, as of 29 Oct 2026; FIRST EPSS, as of 29 Oct 2026. About the data.

Description

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

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.

Source: CVE List, as of 29 Oct 2026. About the data.

Weakness

CWE-476

CWE-476

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

Date	Event
7 Sep 2026	CVE record published
8 Oct 2026	CVE record last updated

References

7

7 more in the CVE record.

Known exploited Red Hat vulnerabilities

CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability (added 26 Aug 2026)
CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability (added 26 Aug 2026)
CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability (added 28 Sep 2023)
CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability (added 12 May 2023)
CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability (added 27 Jun 2022)