registry / Remote code execution / chai-as-disarmed

chai-as-disarmed

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

This report shows the evidence for chai-as-disarmed@3.2.3, 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 4mo ago · by lpm-firewall-ai

Source inspection confirms concrete runtime remote code execution from an obfuscated external endpoint, unrelated to legitimate chai assertion behavior. Although there is no install hook, the package should be blocked because normal package use can run attacker-controlled code.

Static reason

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

Trigger

Runtime use of main middleware or import of lib/transport.js

Impact

Arbitrary remote JavaScript execution in the installing application's environment

Mechanism

detached child process plus remote fetch and dynamic Function execution

Attack narrative

index.js is the package main and exposes middleware that spawns a detached Node process for lib/caller.js. That file decodes an external jsonstorage URL and header, fetches a cookie field, constructs a Function with require access, and executes the fetched payload. lib/transport.js also imports ./caller, making the remote loader run on that import path.

AI rationale

Evidence

package.jsonindex.jslib/caller.jslib/transport.jslib/const.jsREADME.md

Network endpoints1

api.jsonstorage.net/v1/json/2ef8c758-a96f-459e-b036-b3b90379a165/a179ea35-b962-4722-b3f1-e28316d1a44a

Decision evidence

public snapshot

AI called this Malicious at 98.0% confidence as Malware with low false-positive risk.

Evidence for block

index.js main exports middleware that spawns detached node process running lib/caller.js when invoked.
lib/caller.js decodes hidden URL and header values from base64-like strings.
lib/caller.js fetches remote JSON from api.jsonstorage.net and reads .data.cookie.
lib/caller.js executes fetched string with new Function.constructor("require", s).
lib/transport.js imports ./caller, causing caller IIFE on module import.
Package appears to masquerade as pino/chai docs while main behavior is remote loader.

Evidence against

package.json has no npm lifecycle install hooks.
No local file write/delete persistence observed in inspected package source.
No credential harvesting from real process.env observed; lib/caller.js shadows process with hardcoded values.

Behavioral surface

Source

ChildProcessEnvironmentVarsNetwork

Supply chain

HighEntropyStringsUrlStrings

Manifest

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);

High

Base64 Obscured Url

Source decodes a Base64-obscured HTTP endpoint at runtime.

lib/caller.jsView on unpkg · L2

index.jsView file

•matchType = malicious_source_fingerprint_signature signature = 306e52008bef5331 signatureType = suspicious_hashes sourceLabel = OpenSSF malicious-packages matchedPackage = chai-as-synced@6.0.3 matchedPath = index.js matchedIdentity = npm:Y2hhaS1hcy1zeW5jZWQ:6.0.3 similarity = 1.000 shingleOverlap = 12 summary = Malicious code in chai-as-synced (npm)

High

Known Malware Source Fingerprint Signature

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

index.jsView on unpkg

docs/transports.mdView file

550patternName = generic_password severity = medium line = 550 matchedText = password...rd',

Medium

Secret Pattern

Hardcoded password in docs/transports.md

docs/transports.mdView on unpkg · L550

Source & flagged code

3 flagged · loading source

lib/caller.jsView file

High

Base64 Obscured Url

Source decodes a Base64-obscured HTTP endpoint at runtime.

lib/caller.jsView on unpkg · L2

index.jsView file

High

Known Malware Source Fingerprint Signature

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

index.jsView on unpkg

docs/transports.mdView file

Findings

3 High3 Medium3 Low

HighEval

HighBase64 Obscured Urllib/caller.js

HighKnown Malware Source Fingerprint Signatureindex.js

MediumNetwork

MediumEnvironment Vars

MediumSecret Patterndocs/transports.md

LowScripts Present

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to chai-as-disarmed@3.2.3.

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

Avoid installing chai-as-disarmed@3.2.3. 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: 2026-07-09 16:31:53.092Z (UTC).

Source advisory published: 2026-07-09 15:31:23.000Z (UTC).

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

Versions

1 known version

3.2.3latestshownMaliciousRemote Code ExecutionBlockPublishedJul 5, 2026, 9:05 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