registry / Credential exfiltration / chai-leaf

chai-leaf

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

This report shows the evidence for chai-leaf@1.4.8. 4 of 5 known versions are blocked or flagged. The newest version, 0.0.1-security, is allowed. See all versions.

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 3mo ago · by lpm-firewall-ai

This is not an install-hook-only finding: the malicious payload is reached by an ordinary import. Its concealed host collection and outbound transmission are incompatible with the package's advertised middleware behavior.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

Runtime require/import of chai-leaf.

Impact

Leaks host-identifying data and exposes file/process operations to a concealed payload.

Mechanism

Obfuscated host collection with HTTP exfiltration and process/file-system capability.

Attack narrative

The main entrypoint imports lib/config.js during normal package loading. That obfuscated payload initializes immediately, loads OS/filesystem/process/network modules, collects hostname, platform, and username, and sends a structured axios request with a generated cryptographic validation value. It also contains filesystem enumeration and child-process execution paths, making the concealed runtime behavior a concrete malicious supply-chain payload.

AI rationale

Evidence

package.jsonindex.jslib/config.js

Decision evidence

public snapshot

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

Evidence for block

index.js imports ./lib/config at module load.
lib/config.js is a 4 MB obfuscated top-level payload.
lib/config.js imports os, fs, child_process, axios, and crypto.
Payload collects hostname, OS, and username, then axios POSTs them with a cryptographic header.
Payload contains fs enumeration, detached spawn, and execSync paths.

Evidence against

package.json has no npm lifecycle hooks.
No clear benign use of lib/config.js is present in the public entrypoint.

Behavioral surface

Source

ChildProcessEnvironmentVars

Supply chain

HighEntropyStringsMinifiedUrlStrings

ManifestNo manifest risk signals triggered.

scanned 15 file(s), 307 KB of source, external domains: github.com

Oversized source lightweight scan

lib/config.js3.88 MB file, sampled 256 KB

Minified

Source & flagged code

4 flagged

index.jsView file

3const path = require('path'); L4: const { spawn } = require('child_process'); L5: const { DEFAULT_LEVELS, SORTING_ORDER } = require('./lib/constants');

High

Child Process

Package source references child process execution.

index.jsView on unpkg · L3

lib/config.jsView file

1function mX(F,S,Y,E,i){const Ta={F:0x2d8};return T(S-Ta.F,Y);}function mI(F,S,Y,E,i){const Tr={F:0x112};return j(F-Tr.F,S);}function mL(F,S,Y,E,i){const Tq={F:0x12b};return T(i-Tq....

Critical

Download Execute

Source downloads or fetches remote code and executes it.

lib/config.jsView on unpkg · L1

1Trigger-reachable chain: manifest.main -> index.js -> lib/config.js L1: function mX(F,S,Y,E,i){const Ta={F:0x2d8};return T(S-Ta.F,Y);}function mI(F,S,Y,E,i){const Tr={F:0x112};return j(F-Tr.F,S);}function mL(F,S,Y,E,i){const Tq={F:0x12b};return T(i-Tq....

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

lib/config.jsView on unpkg · L1

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

4 flagged · loading source

index.jsView file

3const path = require('path'); L4: const { spawn } = require('child_process'); L5: const { DEFAULT_LEVELS, SORTING_ORDER } = require('./lib/constants');

High

Child Process

Package source references child process execution.

index.jsView on unpkg · L3

lib/config.jsView file

1function mX(F,S,Y,E,i){const Ta={F:0x2d8};return T(S-Ta.F,Y);}function mI(F,S,Y,E,i){const Tr={F:0x112};return j(F-Tr.F,S);}function mL(F,S,Y,E,i){const Tq={F:0x12b};return T(i-Tq....

Critical

Download Execute

Source downloads or fetches remote code and executes it.

lib/config.jsView on unpkg · L1

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

Findings

2 Critical1 High3 Medium3 Low

CriticalDownload Executelib/config.js

CriticalTrigger Reachable Dangerous Capabilitylib/config.js

HighChild Processindex.js

MediumEnvironment Vars

MediumStructural Risk Force Deep Review

MediumSecret Patterndocs/transports.md

LowScripts Present

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to chai-leaf@1.4.8.

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

Avoid installing chai-leaf@1.4.8. 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: 2026-09-24 09:00:43.134Z (UTC).

Source advisory published: 2026-07-21 00:47:19.000Z (UTC).

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

Versions

5 known versions

0.0.1-securitylatestClean—AllowPublishedJul 21, 2026, 12:46 AM 1.4.8shownMaliciousCredential ExfiltrationBlockPublishedJul 20, 2026, 9:11 PM 1.4.7MaliciousMalwareBlockPublishedJul 18, 2026, 9:07 AM 1.4.6MaliciousMalwareBlockPublishedJul 18, 2026, 8:39 AM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other credential exfiltration packages

Behavioral surface

Source & flagged code

Related packages

Other credential exfiltration packages