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CVE-2025-59390

Apache Druid authentication bypass

9.8 CRITICALEPSS 0.61%
  1. Published26 Nov 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache Druid< 35.0.0

Remediation

Fixed in
Apache Druid≥ 35.0.0

References

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Frequently asked

Is CVE-2025-59390 being actively exploited?

CVE-2025-59390 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.61%.

How severe is CVE-2025-59390?

CVE-2025-59390 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.61% probability of exploitation.

Which products are affected by CVE-2025-59390?

Affected products include Apache Druid.

How do I fix CVE-2025-59390?

Upgrade affected software to a fixed version, for example Apache Druid 35.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.