Is CVE-2025-59390 actively exploited?

No active exploitation of CVE-2025-59390 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-59390 be exploited remotely?

Yes. CVE-2025-59390 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-59390?

CVE-2025-59390 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2025-59390

CWE-338Published: November 26, 2025· Updated: Jun 17, 2026

9.8

CVSS v3.1

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.

NVD Source

Technical Analysis

CVE-2025-59390 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.