registry / Install hook abuse / @toothfairyai/tfcode / 2.7.0

@toothfairyai/tfcode@2.7.0

**ToothFairyAI's AI coding agent** — a command-line interface that brings AI-powered coding assistance to your terminal with deep ToothFairyAI workspace integration.

AI Security Review

scanned 13d ago · by lpm-firewall-ai

The postinstall hook performs unpinned remote binary installation and user-level pip installation, which leaves a real supply-chain risk. The inspected source does not establish malicious intent or a concrete attack, so this warrants a warning rather than a block.

Static reason

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

Trigger

Installing the npm package runs its postinstall script.

Impact

The downloaded binary and installed Python packages can execute code; the release version and archive integrity are not pinned in the inspected flow. The vendor-aligned purpose is apparent, so malicious behavior is not established.

Mechanism

The installer fetches the latest release from a configurable Gitea host, downloads a platform archive, and invokes pip to install packages for the current user.

AI rationale

Evidence

package.jsonpostinstall.mjsbin/tfcode.js

Network endpoints1

gitea.toothfairyai.com

Decision evidence

public snapshot

AI called this Suspicious at 89.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The postinstall hook automatically runs the installer.
The installer fetches the latest release and downloads a platform binary from a configurable host without a pinned version or integrity check.
The installer also invokes pip to install packages for the current user.
The launcher runs the selected native binary with the caller’s arguments and environment.

Evidence against

The inspected install flow targets ToothFairyAI release assets and its Python SDK, consistent with installing this CLI.
The inspected source shows no credential harvesting or AI-agent control-setting mutation.

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemNetwork

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 2 file(s), 15.4 KB of source, external domains: toothfairyai.com

Source & flagged code

6 flagged

package.jsonView file

Lines 1-28json

2 "name": "@toothfairyai/tfcode",

3 "version": "2.7.0",

4 "bin": {

5 "tfcode": "./bin/tfcode.js"

6 },

7 "scripts": {

8 "postinstall": "node ./postinstall.mjs"

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L8

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg · L8

9 },

10 "license": "MIT",

11 "optionalDependencies": {

12 "@toothfairyai/tfcode-linux-arm64": "2.7.0",

13 "@toothfairyai/tfcode-windows-x64": "2.7.0",

14 "@toothfairyai/tfcode-linux-x64-baseline-musl": "2.7.0",

15 "@toothfairyai/tfcode-darwin-x64-baseline": "2.7.0",

16 "@toothfairyai/tfcode-linux-x64-musl": "2.7.0",

17 "@toothfairyai/tfcode-windows-x64-baseline": "2.7.0",

18 "@toothfairyai/tfcode-linux-arm64-musl": "2.7.0",

19 "@toothfairyai/tfcode-windows-arm64": "2.7.0",

20 "@toothfairyai/tfcode-linux-x64": "2.7.0",

21 "@toothfairyai/tfcode-darwin-x64": "2.7.0",

22 "@toothfairyai/tfcode-linux-x64-baseline": "2.7.0",

23 "@toothfairyai/tfcode-darwin-arm64": "2.7.0"

24 },

25 "engines": {

26 "node": ">=18"

27 },

28 "homepage": "https://toothfairyai.com/developers/tfcode",

python/tf_sync/config.pyView file

•path = python/tf_sync/config.py kind = build_helper sizeBytes = 7012 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

python/tf_sync/config.pyView on unpkg

bin/tfcode.jsView file

•matchType = normalized_sha256 matchedPackage = @toothfairyai/tfcode@2.5.11 matchedPath = bin/tfcode.js matchedIdentity = npm:QHRvb3RoZmFpcnlhaS90ZmNvZGU:2.5.11 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

bin/tfcode.jsView on unpkg

•matchType = malicious_source_fingerprint_signature signature = 0290b274445d960c signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = @toothfairyai/tfcode@2.5.11 matchedPath = bin/tfcode.js matchedIdentity = npm:QHRvb3RoZmFpcnlhaS90ZmNvZGU:2.5.11 similarity = 1.000 shingleOverlap = 2 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.

bin/tfcode.jsView on unpkg

postinstall.mjsView file

•matchType = normalized_sha256 matchedPackage = @toothfairyai/tfcode@2.5.11 matchedPath = postinstall.mjs matchedIdentity = npm:QHRvb3RoZmFpcnlhaS90ZmNvZGU:2.5.11 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

postinstall.mjsView on unpkg

Source & flagged code

6 flagged · loading source

package.jsonView file

•scripts.postinstall = node ./postinstall.mjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node ./postinstall.mjs

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg

python/tf_sync/config.pyView file

•path = python/tf_sync/config.py kind = build_helper sizeBytes = 7012 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

python/tf_sync/config.pyView on unpkg

Findings

4 High5 Medium4 Low

HighInstall Time Lifecycle Scriptspackage.json

HighKnown Malware Source Similaritybin/tfcode.js

HighKnown Malware Source Similaritypostinstall.mjs

HighKnown Malware Source Fingerprint Signaturebin/tfcode.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumNetwork

MediumEnvironment Vars

MediumShips Build Helperpython/tf_sync/config.py

MediumStructural Risk Force Deep Review

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to @toothfairyai/tfcode@2.7.0.

See all versions of @toothfairyai/tfcode for other recorded verdicts.

Review the evidence and your use of @toothfairyai/tfcode@2.7.0 before allowing it. Restrict the permissions described in this report.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.

Evidence last updated: 2026-10-10 12:12:18.514Z (UTC).

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