express-route-enginenpm
Advisory published Updated
express-route-engine is a confirmed malicious npm package (MAL-2026-14307) that executes malicious code on install (malicious version 3.6.3). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in express-route-engine (npm)
What this malware does
On require/import, index.js immediately invokes an initializer that HTTP-GETs a JSON document from https://api.jsonbin.io/v3/b/6a4f5816f5f4af5e29762c92, extracts the record.cerookie field, and executes its contents as JavaScript via new (Function.constructor)('require',...)(require). The evaluated code runs with full Node.js privileges and access to require, and the payload is hosted on a third-party mutable JSON store controlled by the package author, so the executed code can change at any time without republishing. The file is cover-labeled as normalize-path (ES6 safe version) and contains an unused normalizePath helper and a Safe request helper comment to obscure the loader; the Function constructor is reached indirectly via Function.constructor and the payload field is named cerookie to reduce recognizability. The stated purpose (an Express route engine) has no legitimate need to fetch and evaluate remote code on load.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for express-route-engine (version 3.6.3).
If you installed it — respond
Remove express-route-engine from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If express-route-engine was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks express-route-engine-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.