CVE-2026-23906 Apache Druid: Authentication Bypass via LDAP Anonymous Bind
Attackers bypass authentication in Apache Druid by exploiting LDAP anonymous bind configurations, gaining unauthorized access to data and administrative interfaces.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23906?
CVE-2026-23906 is a critical authentication bypass vulnerability in Apache Druid, published on 10 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-23906?
2 open source packages ship an affected version, including org.apache.druid.extensions:druid-basic-security. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.druid.extensions:druid-basic-security Maven | From 0.17.0 | 36.0.0 |
org.apache.druid.extensions:druid-basic-security Maven | From 0.17.0 | 36.0.0 |
Products include Apache Druid.
How do I fix CVE-2026-23906?
Upgrade org.apache.druid.extensions:druid-basic-security to 36.0.0 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-23906 being exploited?
There is no known exploitation of CVE-2026-23906 in the wild and no public exploit code.
Other vulnerabilities in Apache Druid
- CVE-2025-59390 Apache Druid: Kerberos authenticaton chooses a cryptographically unsecure secret if not configured explicitly.
- CVE-2021-26919 Apache Druid Authenticated users can execute arbitrary code from malicious MySQL database systems.
- CVE-2021-25646 Authenticated users can override system configurations in their requests which allows them to execute arbitrary code.
- CVE-2024-45537 Apache Druid: Users can provide MySQL JDBC properties not on allow list
- CVE-2021-36749 Druid ingestion system Authenticated users can read data from other sources than intended
Sources
Also known as GHSA-q672-hfc7-g833.