To check whether an npm release may have been compromised, verify the exact package name and version, check its registry signature and provenance, and inspect the code and release history for unexpected changes. Then check lockfile integrity and known vulnerability advisories as separate signals. No single command or clean scan proves a release is safe: in particular, npm audit checks for known vulnerability advisories, not every intentionally malicious package.
Start with the exact package and version
Before interpreting a scan or a package-page badge, establish which artifact your project actually uses. Record the package name, version, registry, lockfile entry, and when the dependency was installed or updated. Check for misspellings, unexpected scopes, or names that closely resemble another package. Also confirm that the locked version is the one you intended to install.
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This identity check matters because a check against the right project but the wrong package or version cannot tell you whether the release in your dependency tree is trustworthy. ENISA’s Technical Advisory for Secure Use of Package Managers, version 1.1 (2026), identifies typosquatting and dependency confusion as package-distribution risks.
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Run npm’s signature check
For an installed dependency tree, run:
npm audit signaturesnpm documents this command as checking registry signatures and provenance attestations. Its provenance guide specifies npm CLI v9.5.0 or later and says to install dependencies with npm install or npm ci for this workflow. A missing or invalid signature or attestation produces an error and is a reason to investigate—not, by itself, a complete diagnosis of what happened.
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Read the provenance details
When provenance is available, inspect it on the package’s npm page. npm describes fields that can identify the build environment, workflow, source commit, build file, and transparency-log entry. Compare those details with the project’s expected repository and release process. npm checks whether the linked source commit and repository can be found; a deleted or private repository may prevent provenance from being established.
Interpret absence and invalidity differently. An absent attestation may mean that the package has no provenance. Invalid verification material raises a stronger integrity concern. Neither a successful signature check nor a provenance record establishes that the source code, publisher account, workflow, or build environment was benign.
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Compare the release with the expected project
Review the source commit and tag for the exact version alongside the changelog, maintainers, and files added or changed in that release. Look for unexplained changes, especially:
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- Obfuscated or unexpectedly difficult-to-read code.
- New network requests or access to credentials that do not fit the package’s purpose.
- New binaries or generated files without an explained reason.
- Changes to install hooks, particularly unexplained pre-install or post-install behavior.
Compare the published package with the source and release records rather than assuming that a familiar maintainer name or a successful provenance check settles the question. Provenance helps establish how and by whom a package was published; it cannot show that every build input or publisher account was uncompromised.
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Check the lockfile and installation behavior
Inspect the lockfile entry for the resolved version and its integrity value. ENISA notes that npm uses SHA-512 integrity metadata in the lockfile. This hash helps detect whether an artifact differs from the value recorded for it; it does not prove that the artifact was safe when that value was first recorded.
Review package scripts for actions that run during installation. Pay particular attention to unexpected pre-install or post-install steps that download or execute additional code or binaries. A package can match its lockfile hash and still contain harmful code if the recorded artifact was already malicious.
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Use vulnerability audits for a different question
Run npm audit to check dependencies against known vulnerability advisories. A clean result means no matching known advisory was found; it is not a malware verdict and cannot rule out a compromised release that has not yet been reported in an advisory. ENISA distinguishes inherent vulnerabilities from supply-chain attacks, which is why vulnerability checks and release-integrity checks should be treated as separate lines of inquiry.
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What each check can establish
| Signal | What it helps establish | What it does not establish |
|---|---|---|
| Registry signature | The package name, version, and integrity value match a registry signature under the registry’s signing key. | That the signed release is benign. |
| Provenance attestation | Evidence about where and how a package was built and published, and its association with an authorized publisher. | That the source, workflow, publisher account, or build environment was uncompromised. |
| Lockfile integrity hash | Whether an artifact differs from the integrity value recorded in the lockfile. | Whether the originally recorded artifact was safe. |
npm audit |
Whether dependencies match known vulnerability advisories. | Whether a release contains malicious code that has no matching advisory. |
| Popularity or maintainer history | Context for assessing a project and its release history. | That a particular version is trustworthy; popularity alone can mislead. |
If credible concern remains, assess exposure
Stop consuming the suspect release while you investigate. Identify which projects and environments installed it and whether it ran. Isolate or remove affected dependencies as appropriate, then assess what the package could access in those environments. If it executed where tokens, passwords, signing keys, or cloud credentials were available, decide whether to revoke or rotate them based on the exposure evidence.
OpenAI’s account of its response to the TanStack npm supply-chain attack, amended June 2026, describes incident-specific containment that included isolating impacted systems and identities, revoking sessions, rotating impacted credentials, and reviewing repository access. Those steps illustrate the kinds of response an incident may require; they are not a universal checklist for every package alert.
Quick Recap
A practical decision rule
- Investigate identity first: confirm the exact package, registry, and locked version.
- Treat verification failures as signals: distinguish missing provenance from invalid signatures or attestations, and compare available provenance with the expected release process.
- Review code and behavior: inspect release changes, package files, and installation scripts independently of signature results.
- Keep the checks in scope: integrity metadata detects changes against a recorded value; vulnerability audits surface known advisories. Neither alone establishes that a release is safe.
- Escalate based on execution and access: if the package ran in an environment with valuable credentials, investigate that environment and those credentials according to the evidence.
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