fabric-native-loader

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: amazon-inspector (d289ae71736f05158f45d6636730641e82b5a774bf99bf1b587155d31c73daaa)
package.json declares a postinstall hook that runs index.js on npm install. index.js reads Minecraft launcher credential stores (launcher_accounts.json, launcher_profiles.json, and equivalent files for Prism, MultiMC, TLauncher, Modrinth, PolyMC, GDLauncher), extracting Mojang/Microsoft accessTokens, refreshTokens, and clientTokens. It also recursively walks the.minecraft directory reading.json/.txt/.cfg/.properties/.yml/.log files and matches their contents against JWT and Bearer-token regexes. The collected credentials are combined with os.hostname(), os.userInfo().username, and os.platform() and POSTed via HTTPS to a hardcoded Discord webhook (discord.com/api/webhooks/1554065488726990909/...). No functionality matching the package name is present; the sole effect of installing the package is credential theft against the installer.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/501714751ba269514a0a7215c211de39b4230b65/osv/malicious/npm/fabric-native-loader/MAL-2026-17232.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/501714751ba269514a0a7215c211de39b4230b65/osv/malicious/npm/fabric-native-loader/MAL-2026-17232.json
- https://www.npmjs.com/package/fabric-native-loader/v/1.0.0
- https://github.com/advisories/GHSA-h76r-hhqx-cjq3

Compromised versions (1)

• = 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.