# Apache Druid’s Kerberos authenticator uses a weak fallback secret

Advisory record · `GHSA-w88f-4875-99c8`

- **Identifiers:** `GHSA-w88f-4875-99c8` · `CVE-2025-59390`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-338](https://cwe.mitre.org/data/definitions/338.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md)
- **Published:** 26 Nov 2025
- **Updated:** 26 Nov 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 26 Nov 2025, 09:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `org.apache.druid:druid` (Maven): affected `<35.0.0`; fixed in `35.0.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Apache Druid versions before 35.0.0 (org.apache.druid:druid) use a weak fallback secret for the Kerberos authenticator when druid.auth.authenticator.kerberos.cookieSignatureSecret is not set. The secret is generated with a non-cryptographically secure random number generator, which may let an attacker predict or brute-force it and forge authentication cookies. Upgrade to version 35.0.0, which requires the cookie signature secret to be set; alternatively, configure a strong cookieSignatureSecret explicitly.

Written 7 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0070, the 53rd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:09 UTC: First seen by agentprime
- 31 Oct 2026, 15:09 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-w88f-4875-99c8)

## Sources

- [GitHub Advisory Database: GHSA-w88f-4875-99c8](https://github.com/advisories/GHSA-w88f-4875-99c8)
- [OSV: GHSA-w88f-4875-99c8](https://osv.dev/vulnerability/GHSA-w88f-4875-99c8)
- <https://nvd.nist.gov/vuln/detail/CVE-2025-59390>
- <https://github.com/apache/druid/pull/18368>
- <https://github.com/apache/druid>
- <https://lists.apache.org/thread/jwjltllnntgj1sb9wzsjmvwm9f8rlhg8>
- <http://www.openwall.com/lists/oss-security/2025/11/26/1>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-w88f-4875-99c8>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-w88f-4875-99c8/>. Everything for agents: <https://agentprime.io/llms.txt>.