@coopeuch/config

GHSA-m89q-pg4c-ffx9

Malicious code in @coopeuch/config (npm)

Details

**Severity:** Critical

**Affected versions:** `= 1.999.999`

## Source: amazon-inspector (0c9b2c76aac3e901d6585717a7e1f9729699bf3a4e280eb20a68bcef4d507d0d)
The package publishes to the @coopeuch npm scope at version 1.999.999 with a stub index.js, a shape designed to win resolution over an internal scope registry when an organization's scope-to-registry mapping is missing. On npm install, scripts.postinstall executes postinstall.js, which collects host identity (hostname, username, uid/gid, homedir, non-internal network interface addresses and MAC addresses, DNS servers, reverse-DNS internal FQDN), CI/orchestration markers, npm context, container detection via /proc/1/cgroup, and the consuming parent package's name, version, and declared version range, then POSTs the aggregated JSON over HTTPS to the hardcoded author endpoint collector.oob.s4yhii.com/_npm-poc/beacon alongside a DNS beacon under *.oob.s4yhii.com. The behavior fires automatically at install time without consent and reveals internal infrastructure details and private project identifiers of any organization whose build resolves this package from the public registry.

---

Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/ff41f6680a0ebbef2268cdb5daf253d4b400cb05/osv/malicious/npm/@coopeuch/config/MAL-2026-17762.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/ff41f6680a0ebbef2268cdb5daf253d4b400cb05/osv/malicious/npm/@coopeuch/config/MAL-2026-17762.json
- https://www.npmjs.com/package/@coopeuch/config/v/1.999.999
- https://github.com/advisories/GHSA-m89q-pg4c-ffx9

Compromised versions (1)

= 1.999.999

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.