cbcvebase.
CVE-2026-23906
published 2026-02-10

CVE-2026-23906: 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…

PriorityP273critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
1.03%
60.1th percentile
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.

Affected

2 ranges
VendorProductVersion rangeFixed in
apachedruid>= 0.17.0 < 36.0.036.0.0
apache_software_foundationapache_druid>= 0.17.0 < 36.0.036.0.0

Detection & IOCsextracted from sources · hover to see the quote

  • →Authentication bypass attempt: look for HTTP requests to Apache Druid endpoints where a valid username is supplied with an empty password string, which would indicate exploitation of the anonymous LDAP bind bypass. ↗
  • →Monitor Apache Druid authentication logs for successful logins that correspond to LDAP bind attempts with empty credentials — successful auth events with no password supplied are a strong indicator of exploitation. ↗
  • →Scope detection to Apache Druid deployments running versions 0.17.0 through 35.x with the druid-basic-security extension and LDAP authenticator configured against an LDAP server permitting anonymous bind. ↗
  • →Confirm the druid-basic-security extension and LDAP authenticator are active on the target node as prerequisites for exploitability; non-LDAP auth configurations are not affected. ↗
  • ·The vulnerability is only exploitable when all three prerequisites are simultaneously met: druid-basic-security extension enabled, LDAP authenticator configured, and the underlying LDAP server permits anonymous bind. Environments not using LDAP authentication are not affected. ↗
  • ·Disabling anonymous bind on the LDAP server is a sufficient immediate mitigation without requiring a Druid upgrade, as it removes the condition that makes the bypass possible. ↗
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