OpenSSF/OSV advisory MAL-2026-6291 confirms this npm version as malicious. package.json declares a postinstall script that runs automatically on `npm install` and performs `require('https').get(...)` to a Burp Collaborator subdomain (`7rzjsf29azci2qjsm6kxt23ag1mtanyc.oastify.com`), passing `os.hostname()` and `os.userInfo().username` as query parameters. Any developer or build system installing this package leaks host identity to an external attacker-controlled OAST endpoint...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in @outmarket/ui (npm)
Details
package.json declares a postinstall script that runs automatically on `npm install` and performs `require('https').get(...)` to a Burp Collaborator subdomain (`7rzjsf29azci2qjsm6kxt23ag1mtanyc.oastify.com`), passing `os.hostname()` and `os.userInfo().username` as query parameters. Any developer or build system installing this package leaks host identity to an external attacker-controlled OAST endpoint. The package's own description (`PENTEST-PoC: Dependency confusion - SecurifyAI engagement 2026-06-23`) and the version `9.9.9` published under the `@outmarket` scope indicate the package is designed to win resolution against an internal private package of the same name and harvest beacons from anyone in the targeted organization who installs it.
Decision reason
OpenSSF Malicious Packages via OSV confirms @outmarket/ui@9.9.9 as malicious (MAL-2026-6291): Malicious code in @outmarket/ui (npm)