Express
npmexpressExpress is the most widely used Node.js web framework, powering a vast share of all Node.js HTTP servers. It handles request routing, middleware composition, and response generation. Express is used in production APIs, proxy servers, and microservices across virtually every industry.
Checking Express
express 4.21.0 is a clean, monitored version with no known supply chain compromise. The example response returns supply_chain_monitored: true and compromised: false with an empty sources array.
curl "https://api.attestd.io/v1/check?product=express&version=4.21.0" \
-H "Authorization: Bearer YOUR_API_KEY"{
"product": "express",
"version": "4.21.0",
"supported": true,
"risk_state": "none",
"risk_factors": [],
"actively_exploited": false,
"remote_exploitable": false,
"authentication_required": false,
"patch_available": false,
"fixed_version": null,
"confidence": 0.9,
"cve_ids": [],
"cves": null,
"max_epss": null,
"typosquat": null,
"supply_chain_monitored": true,
"supply_chain": {
"compromised": false,
"sources": [],
"malware_type": null,
"description": null,
"advisory_url": null,
"compromised_at": null,
"removed_at": null
},
"last_updated": "2026-05-01T00:00:00Z"
}Why this package is monitored
Express middleware runs on every request before application routes. A poisoned release can capture bodies, Authorization headers, and session cookies across the whole server.
Attestd monitors express using the following detection sources:
registryManually curated advisories in the Attestd registry, verified by a human analyst. Confidence 1.0.
osvOSV.dev malicious-package advisories with IDs prefixed MAL-. Confidence 0.95.
npm_deprecationnpm package versions with deprecation messages containing targeted attack language such as malicious, backdoor, or compromised. Confidence 0.80.