CVE-2026-18453
Published:September 07, 2026
Updated:September 22, 2026
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.
Affected Packages
https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) =389-ds-base-3.3.0 <389-ds-base-3.3.1Fix Suggestion:
Update to version 389-ds-base-3.3.1https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) >=389-ds-base-2.8.0 <389-ds-base-2.8.2Fix Suggestion:
Update to version 389-ds-base-2.8.2https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) >=389-ds-base-2.4.0 <389-ds-base-2.4.7Fix Suggestion:
Update to version 389-ds-base-2.4.7https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) >=389-ds-base-3.0.1 <389-ds-base-3.0.7Fix Suggestion:
Update to version 389-ds-base-3.0.7https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) =389-ds-base-2.9.0 <389-ds-base-2.9.1Fix Suggestion:
Update to version 389-ds-base-2.9.1https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) >=389-ds-base-3.2.0 <389-ds-base-3.2.3Fix Suggestion:
Update to version 389-ds-base-3.2.3https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) >=389-ds-base-1.4.3.1 <389-ds-base-1.4.3.41Fix Suggestion:
Update to version 389-ds-base-1.4.3.41https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) >=389-ds-base-3.1.0 <389-ds-base-3.1.5Fix Suggestion:
Update to version 389-ds-base-3.1.5https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) >=389-ds-base-2.2.0 <389-ds-base-2.2.11Fix Suggestion:
Update to version 389-ds-base-2.2.11https://github.com/389ds/389-ds-base.git (GITHUB):
Affected version(s) >=389-ds-base-2.6.0 <389-ds-base-2.6.3Fix Suggestion:
Update to version 389-ds-base-2.6.3Related Resources (18)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
NULL Pointer Dereference
EPSS
Base Score:
0.85