fabric-render-bridge

GHSA-r54m-4q33-rjvr

Malicious code in fabric-render-bridge (npm)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: amazon-inspector (c2715ef0b07fbf0ca24fb8dadec44f2fcfdc273421a49ad2201bf8e40d3e2c01)
package.json declares postinstall="node index.js", so `npm install fabric-render-bridge` automatically executes index.js. index.js reads Minecraft launcher credential stores across multiple launchers (launcher_accounts.json and launcher_profiles.json for the official launcher, PrismLauncher, MultiMC, TLauncher, Modrinth, PolyMC, GDLauncher) plus a session dump from the OS temp directory, extracts accessToken/refreshToken values and account usernames, and POSTs them via https.request to a hardcoded Discord webhook at discord.com/api/webhooks/1554065488726990909/. A separate sendInfo() routine POSTs os.hostname(), os.userInfo().username, os.platform() and os.release() to the same webhook on every install. The package presents itself as a Fabric render bridge but ships no rendering functionality; its sole install-time behavior is credential and host-identity theft.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/9c4594ea270f8ce1185755115d5eb811c41d8589/osv/malicious/npm/fabric-render-bridge/MAL-2026-17225.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/9c4594ea270f8ce1185755115d5eb811c41d8589/osv/malicious/npm/fabric-render-bridge/MAL-2026-17225.json
- https://www.npmjs.com/package/fabric-render-bridge/v/1.0.0
- https://github.com/advisories/GHSA-r54m-4q33-rjvr

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.