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                            CERT-Renater

                Note d'Information No. 2026/VULN140
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DATE                : 10/02/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache Druid versions
                            prior to 36.0.0.

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https://lists.apache.org/thread/2x9rv3kv6t1p577lvq4z0rl0zlt9g4sr
_____________________________________________________________________

Severity: important 

Affected versions:

- Apache Druid (org.apache.druid.extensions:druid-basic-security) 
0.17.0 before 36.0.0

Description:

Affected Products and Versions
  *  Apache Druid
  *  Affected Versions: 0.17.0 through 35.x (all versions prior to 
36.0.0)
  *  Prerequisites:  *  druid-basic-security extension enabled
  *  LDAP authenticator configured
  *  Underlying LDAP server permits anonymous bind                                                                 
                                                                     
             

Vulnerability Description

An authentication bypass vulnerability exists in Apache Druid when 
using the druid-basic-security extension with LDAP authentication. If 
the underlying LDAP server is configured to allow anonymous
binds, an attacker can bypass authentication by providing an existing 
username with an empty password. This allows unauthorized access to 
otherwise restricted Druid resources without valid credentials.

The vulnerability stems from improper validation of LDAP 
authentication responses when anonymous binds are permitted, 
effectively treating anonymous bind success as valid user 
authentication. 


Impact

A remote, unauthenticated attacker can:
  *  Gain unauthorized access to the Apache Druid cluster
  *  Access sensitive data stored in Druid datasources
  *  Execute queries and potentially manipulate data
  *  Access administrative interfaces if the bypassed account has 
elevated privileges
  *  Completely compromise the confidentiality, integrity, and 
availability of the Druid 
deployment                                                           
                                                                                                                     

Mitigation
 
Immediate Mitigation (No Druid Upgrade Required):                                                             
                                                                       
                
  *  Disable anonymous bind on your LDAP server. This prevents the 
vulnerability from being exploitable and is the recommended 
immediate action.


Resolution
  *  Upgrade Apache Druid to version 36.0.0 or later, which includes 
fixes to properly reject anonymous LDAP bind attempts.


References:

https://druid.apache.org
https://www.cve.org/CVERecord?id=CVE-2026-23906

 
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