Druid Javascript Rce

Organization

cxcscmu

druid-javascript-rce

Apache Druid JavaScript RCE vulnerability (CVE-2021-25646) fix via @JacksonInject hardening and constructor validation.

Overview

Publisher	cxcscmu
Repository	`SkillLearnBench`
Skill name	`druid-javascript-rce`
Stars	91
Forks	7
Bundled files	Instructions only
License	MIT
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
Self-contained
Everything the model needs lives in the instructions — no extra files to sync.
Open source
Published by cxcscmu on GitHub. Read the source before you install it.

Installation

Install the Druid Javascript Rce AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/cxcscmu/SkillLearnBench/tree/main/skills/b1-one-shot-claude-opus-4-6/fix-security-bug/druid-javascript-rce
Enable the skill in any chat where you want it available.

Store

Installed

Skills

Add skills

Import one or more skills from a public GitHub folder or a local .skill or .zip archive, or SKILL.md file.

From GitHub URLFrom .skill, .zip, or SKILL.md

GitHub repo or folder

https://github.com/cxcscmu/SkillLearnBench/tree/main/skills/b1-one-shot-claude-opus-4-6/fix-security-bug/druid-javascript-rce

Points to a single skill folder, or any folder that contains multiple skills. Public repos only.

CancelContinue

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/cxcscmu/SkillLearnBench.git /tmp/SkillLearnBench
mkdir -p .claude/skills
cp -r /tmp/SkillLearnBench/skills/b1-one-shot-claude-opus-4-6/fix-security-bug/druid-javascript-rce .claude/skills/druid-javascript-rce

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Druid Javascript Rce in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Druid Javascript Rce on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Druid Javascript Rce is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Apache Druid JavaScript RCE Vulnerability

Overview

Apache Druid 0.20.0 allows authenticated users to execute arbitrary server-side code through JavaScript-based features (filters, aggregators, extraction functions, etc.) even when JavaScript is disabled via druid.javascript.enabled=false.

Root Cause

All JavaScript-related classes use @JacksonInject JavaScriptConfig config to receive the server-side JavaScript configuration. Jackson's default behavior allows JSON input to override injected values via an empty key "".

Affected Classes

JavaScriptDimFilter - processing module
JavaScriptAggregatorFactory - processing module
JavaScriptExtractionFn - processing module
JavaScriptPostAggregator - processing module
JavaScriptParseSpec - core module
JavaScriptTieredBrokerSelectorStrategy - server module (already has constructor check)

Fix Strategy

For each affected class:

Change @JacksonInject to @JacksonInject(useInput = OptBoolean.FALSE)
Add Preconditions.checkState(config.isEnabled(), "JavaScript is disabled") in constructors that don't already have it

Exploit Payload Example

json
{
  "type": "index",
  "spec": {
    "dataSchema": {
      "transformSpec": {
        "filter": {
          "type": "javascript",
          "dimension": "dim",
          "function": "function(x){java.lang.Runtime.getRuntime().exec('cmd')}",
          "": {"enabled": true}
        }
      }
    }
  }
}

Modules Requiring Rebuild

druid-core (JavaScriptParseSpec)
druid-processing (JavaScriptDimFilter, JavaScriptAggregatorFactory, JavaScriptExtractionFn, JavaScriptPostAggregator)
druid-server (JavaScriptTieredBrokerSelectorStrategy)
druid-indexing-service (sampler endpoint, depends on above)

Frequently asked questions

What does the Druid Javascript Rce AI skill do?

Apache Druid JavaScript RCE vulnerability (CVE-2021-25646) fix via @JacksonInject hardening and constructor validation.

Why use Druid Javascript Rce on TypingMind?

Because you install it once and use it with any model. Druid Javascript Rce is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Druid Javascript Rce in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/cxcscmu/SkillLearnBench/tree/main/skills/b1-one-shot-claude-opus-4-6/fix-security-bug/druid-javascript-rce. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Druid Javascript Rce?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Druid Javascript Rce?

As many as you like. As long as a model supports skills, you can use Druid Javascript Rce with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Druid Javascript Rce AI skill free?

Yes. It is published on GitHub by cxcscmu under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Apache Druid JavaScript RCE Vulnerability

Overview

Root Cause

Affected Classes

Fix Strategy

Exploit Payload Example

Modules Requiring Rebuild

Frequently asked questions

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