CVE-2025-59390 Apache Druid: Kerberos authenticaton chooses a cryptographically unsecure secret if not configured explicitly.
Apache Druid uses a weak random secret for Kerberos cookies by default, allowing attackers to forge tokens and bypass authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-59390?
CVE-2025-59390 is a critical vulnerability in Apache Druid, published on 26 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Apache Druid’s Kerberos authenticator uses a weak fallback secret when the `druid.auth.authenticator.kerberos.cookieSignatureSecret` configuration is not explicitly set. In this case, the secret is generated using `ThreadLocalRandom`, which is not a crypto-graphically secure random number generator. This may allow an attacker to predict or brute force the secret used to sign authentication cookies, potentially enabling token forgery or authentication bypass. Additionally, each process generates its own fallback secret, resulting in inconsistent secrets across nodes. This causes authentication failures in distributed or multi-broker deployments, effectively leading to a incorrectly configured clusters. Users are advised to configure a strong `druid.auth.authenticator.kerberos.cookieSignatureSecret`
This issue affects Apache Druid: through 34.0.0.
Users are recommended to upgrade to version 35.0.0, which fixes the issue making it mandatory to set `druid.auth.authenticator.kerberos.cookieSignatureSecret` when using the Kerberos authenticator. Services will fail to come up if the secret is not set.
Weakness: CWE-338
Which versions are affected by CVE-2025-59390?
2 open source packages ship an affected version, including org.apache.druid:druid. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.druid:druid Maven | All versions | 35.0.0 |
org.apache.druid:druid Maven | All versions | 35.0.0 |
Products include Apache Druid.
How do I fix CVE-2025-59390?
Upgrade org.apache.druid:druid to 35.0.0 or later.
Is CVE-2025-59390 being exploited?
There is no known exploitation of CVE-2025-59390 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Apache Druid
- CVE-2026-23906 Apache Druid: Authentication Bypass via LDAP Anonymous Bind
- 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-w88f-4875-99c8.