registry / Remote code execution / chai-as-reformed

chai-as-reformed

This document describes the management of vulnerabilities for the project and all modules within the organization.

This report shows the evidence for chai-as-reformed@1.2.0, the only known version.

This package appears in our research on the fake chai plugin campaign, with how it works, the full package list and what to do if you installed it.

AI Security Review

scanned 2mo ago · by lpm-firewall-ai

Source inspection confirms a concealed remote-response-to-Function execution chain, not merely suspicious primitives. Absence of lifecycle hooks limits the trigger but does not remove the concrete runtime RCE behavior.

Static reason

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

Trigger

Application runtime invocation of the exported middleware.

Impact

Remote operator can execute arbitrary Node.js code in the consuming application's context.

Mechanism

Detached remote payload fetch followed by dynamic code execution.

Attack narrative

At runtime, index.js launches lib/caller.js as a detached Node process. caller.js decodes a concealed remote URL, requests JSON from it, takes the cookie field as source code, constructs a function with require available, and executes it. The remote response therefore controls code running on the consumer host.

AI rationale

Evidence

package.jsonindex.jslib/caller.js

Network endpoints1

api.jsonstorage.net/v1/json/2ef8c758-a96f-459e-b036-b3b90379a165/f89e8264-86c2-4684-94da-c3f82d59370f

Decision evidence

public snapshot

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

Evidence for block

package.json exposes index.js with no lifecycle hook.
index.js spawns detached lib/caller.js whenever exported middleware is invoked.
lib/caller.js Base64-decodes a hard-coded api.jsonstorage.net URL.
lib/caller.js fetches response data.cookie and executes it via Function constructor.
Remote code receives require, enabling arbitrary local module access.

Evidence against

No preinstall, install, or postinstall script is declared.
The remote loader is runtime-triggered rather than install-time.

Behavioral surface

Source

ChildProcessEnvironmentVarsNetwork

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 17 file(s), 52.6 KB of source, external domains: github.com

Source & flagged code

3 flagged

lib/caller.jsView file

2L3: const axios = require("axios"); L4: const process = { ... L12: (async function loadCallers(..._args) { L13: const src = atob(process.env.DEV_API_KEY); L14: const k = atob(process.env.DEV_SECRET_KEY);

Critical

Remote Response Code Execution

Source passes code obtained from a remote response into a dynamic execution sink.

lib/caller.jsView on unpkg · L2

High

Base64 Obscured Url

Source decodes a Base64-obscured HTTP endpoint at runtime.

lib/caller.jsView on unpkg · L2

•matchType = malicious_source_fingerprint_signature signature = 306e52008bef5331 signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = chai-as-inspired@2.2.4 matchedPath = index.js matchedIdentity = npm:Y2hhaS1hcy1pbnNwaXJlZA:2.2.4 similarity = 1.000 shingleOverlap = 12 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

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

lib/caller.jsView on unpkg

Source & flagged code

3 flagged · loading source

lib/caller.jsView file

Critical

Remote Response Code Execution

Source passes code obtained from a remote response into a dynamic execution sink.

lib/caller.jsView on unpkg · L2

High

Base64 Obscured Url

Source decodes a Base64-obscured HTTP endpoint at runtime.

lib/caller.jsView on unpkg · L2

High

Known Malware Source Fingerprint Signature

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

Findings

1 Critical3 High3 Medium3 Low

CriticalRemote Response Code Executionlib/caller.js

HighEval

HighBase64 Obscured Urllib/caller.js

HighKnown Malware Source Fingerprint Signaturelib/caller.js

MediumNetwork

MediumEnvironment Vars

MediumStructural Risk Force Deep Review

LowScripts Present

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to chai-as-reformed@1.2.0.

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

Avoid installing chai-as-reformed@1.2.0. 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: 2026-08-10 17:04:13.537Z (UTC).

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

Versions

1 known version

1.2.0latestshownMaliciousRemote Code ExecutionBlockPublishedAug 10, 2026, 5:01 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

Related packages

Other remote code execution packages

Source & flagged code