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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:64771
https://access.redhat.com/errata/RHSA-2026:64776
https://access.redhat.com/errata/RHSA-2026:64778
https://access.redhat.com/errata/RHSA-2026:64779
https://access.redhat.com/errata/RHSA-2026:64780
https://access.redhat.com/errata/RHSA-2026:64781
https://access.redhat.com/errata/RHSA-2026:64783
https://access.redhat.com/errata/RHSA-2026:64784
https://access.redhat.com/errata/RHSA-2026:64785
https://access.redhat.com/errata/RHSA-2026:64789
https://access.redhat.com/errata/RHSA-2026:64790
https://access.redhat.com/errata/RHSA-2026:64791
https://access.redhat.com/errata/RHSA-2026:64792
https://access.redhat.com/errata/RHSA-2026:64793
https://access.redhat.com/errata/RHSA-2026:64804
https://access.redhat.com/errata/RHSA-2026:65119
https://access.redhat.com/errata/RHSA-2026:79217
https://access.redhat.com/security/cve/CVE-2026-18453
https://bugzilla.redhat.com/show_bug.cgi?id=2509696

Configurations

No configuration.

History

08 Oct 2026, 15:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:79217 -

Information

Published : 2026-09-07 15:17

Updated : 2026-10-08 15:17

NVD link : CVE-2026-18453

Mitre link : CVE-2026-18453

CVE.ORG link : CVE-2026-18453

JSON object : View

Products Affected

No product.

CWE

CWE-476

NULL Pointer Dereference

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"product": "Red Hat Directory Server 13.2", "versions": [{"status": "unaffected", "version": "1788851765", "lessThan": "*", "versionType": "rpm"}], "packageName": "dirsrv/dirsrv-container-rhel10", "collectionURL": "https://catalog.redhat.com/software/containers/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:directory_server:12"], "vendor": "Red Hat", "product": "Red Hat Directory Server 12", "packageName": "redhat-ds:12/389-ds-base", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:directory_server:13"], "vendor": "Red Hat", "product": "Red Hat Directory Server 13", "packageName": "389-ds-base", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/o:redhat:enterprise_linux:6"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "packageName": "389-ds-base", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unknown"}]}], "published": "2026-09-07T15:17:31.017", "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:64771", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64776", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64778", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64779", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64780", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64781", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64783", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64784", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64785", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64789", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64790", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64791", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64792", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64793", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:64804", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:65119", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:79217", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-18453", "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509696", "source": "secalert@redhat.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-10-08T15:17:52.400", "sourceIdentifier": "secalert@redhat.com"}