CVE-2025-59390Network attack vector

Authentication bypass via predictable cookie-signing secret

Published Nov 26, 2025 · Updated Dec 11, 2025

Authentication bypass in Apache Druid 34.0.0 and earlier allows remote attackers to forge Kerberos authentication cookies. KerberosAuthenticator falls back to a per-process ThreadLocalRandom long when cookieSignatureSecret is absent, then uses it as signature.secret. The Kerberos authenticator must be enabled without an explicit cookie secret; predicted secrets permit cookie forgery, while node-specific secrets also break multi-broker authentication.

CVSS severity9.8
Critical
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Apache Druid 34.0.0 and earlier allows remote attackers to forge Kerberos authentication cookies. KerberosAuthenticator falls back to a per-process ThreadLocalRandom long when cookieSignatureSecret is absent, then uses it as signature.secret. The Kerberos authenticator must be enabled without an explicit cookie secret; predicted secrets permit cookie forgery, while node-specific secrets also break multi-broker authentication.

The record

CVE
CVE-2025-59390
Published
Nov 26, 2025
Updated
Dec 11, 2025
Vendor
The Apache Software Foundation
Product
Apache Druid
Classifications
CWE-338, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=34.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Druidversion=0 <=34.0.0

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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