zystcdemo (npm) · Malicious Code
Affects zystcdemoSource GCVE Database
Malicious package : remove zystcdemo and rotate any secrets on hosts that installed it.
Data as of 13 Nov 2026, 03:29 UTC
Malicious package
Published to npm · OSV MAL-2026-18447
What to do
Remove zystcdemo 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 |
|---|---|---|
| npmzystcdemo | Affected
| Fixed in– |
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Description
The npm package 'zystcdemo' masquerades as a date formatting utility but contains a malicious postinstall script. This script executes automatically during installation, collecting system information such as the current user, hostname, platform, and time. It then sends this data to a remote server unrelated to the package's stated functionality. The package version 1.0.0 is affected.