supersig (npm) · Malicious Code
Affects supersigSource GCVE Database
Malicious package : remove supersig and rotate any secrets on hosts that installed it.
Data as of 12 Sep 2026, 06:31 UTC
Malicious package
Published to npm · OSV MAL-2026-13461
What to do
Remove supersig from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| npmsupersig | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
The supersig npm package version 1.0.5 contains malicious code concealed in its distributed bundles that is not present in the source tree. This code decrypts and executes a payload at load time by spawning a new Node.js process and feeding it decrypted code from an external dependency. The decryption key is obtained from an unpinned dependency, allowing the payload to be changed dynamically by whoever controls that dependency. Any system with this package installed should be considered fully compromised.