Is contracts-upgradeable malicious?
Yes. Protet confirmed 1 version of contracts-upgradeable as malicious
First confirmed on 2026-11-07.
Affected versions
| Version | Confirmed | Protet record |
|---|---|---|
| 1.0.0 | 2026-11-07 | PROTET-NPM-2026-172 |
What it does
contracts-upgradeable takes the unscoped name of @openzeppelin/contracts-upgradeable. Its preinstall script runs 'node preinstall.js' on npm install, which sends the machine's hostname, the OS user name and the local time by HTTPS POST to a hardcoded Discord webhook. It has no functional code. Remove the package and treat the hostnames and user names of affected machines as disclosed. Also listed as MAL-2026-18451.
Other reports
- Also reported in OSV as MAL-2026-18451
What to do if you installed it
- Remove the package from every project that uses it, directly or through another dependency.
- Pin a clean version if you need the package: one that is not listed above and that you have checked yourself, or replace the package. A version missing from this page is not cleared.
- Check your lockfiles (
package-lock.json,yarn.lock,pnpm-lock.yaml) for the affected versions, including as a transitive dependency, and in CI caches. - Rotate credentials that were reachable from any machine or build that installed it: npm and GitHub tokens, cloud keys, SSH keys, and secrets in environment variables or CI settings.
Status history
- 2026-11-07: 1.0.0 named by Protet Intel