Predictable Seed in Pseudo-Random Number Generator (PRNG) in Apache Druid - CVE-2025-59390
Published: November 28, 2025
Vulnerability identifier: #VU118821
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2025-59390
CWE-ID: CWE-337
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Apache Foundation
Affected software:
Apache Druid
Apache Druid
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authentication.
The vulnerability exists due to Apache Druid’s Kerberos authenticator uses a weak fallback secret when the `druid.auth.authenticator.kerberos.cookieSignatureSecret` configuration is not explicitly set. As a result the secret is generated using `ThreadLocalRandom`, which is not a crypto-graphically secure random number generator.A remote attacker can predict or brute force the secret used to sign authentication cookies, enabling token forgery or authentication bypass.
How to mitigate CVE-2025-59390
Install updates from vendor's website.