oh-langfuse@1.2.1

Use npm scripts to configure Claude Code / OpenCode / Codex / DeepSeek Harness with Langfuse tracing.

AI Security Review

scanned 9d ago · by lpm-firewall-ai

The manifest has no npm install lifecycle hook, and the flagged agent configuration writes are reached through explicit setup commands. Automatic updates are gated by an explicit auto setting or user confirmation, so the inspected behavior supports normal Langfuse setup rather than a confirmed attack.

Static reason

One or more suspicious static signals were detected.

Trigger

A user runs a setup command; automatic updating requires an affirmative setting or confirmation.

Impact

The source shows user-requested tracing configuration and updates; it does not establish unconsented agent control or credential disclosure.

Mechanism

Setup installs the Langfuse hook and writes Langfuse configuration for the selected agent. The updater checks npm metadata and runs the corresponding setup script when updating.

AI rationale

Evidence

scripts/codex-langfuse-setup.mjsscripts/langfuse-setup.mjsscripts/update-langfuse-runtime.mjs

Network endpoints1

registry.npmjs.org

Decision evidence

public snapshot

AI called this Clean at 88.0% confidence as Benign with low false-positive risk.

Evidence for AI clean decision

The manifest exposes setup and update commands but defines no npm preinstall, install, or postinstall hook.
Setup runs from an explicit CLI command. Codex setup writes its hook and Langfuse configuration under the Codex home directory.
Claude setup writes the Langfuse hook under the Claude hooks directory and adds Langfuse settings to Claude configuration when setup runs.
The updater checks the npm registry and invokes setup scripts for detected targets; automatic updates require an explicit auto setting, while the default is to ask.
The flagged CLI runtime location contains argument parsing, and its setup dispatch is reached only for the setup command.

Evidence against

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

Manifest

Source & flagged code

8 flagged

bin/cli.jsView file

Lines 1-26javascript

1#!/usr/bin/env node

2import fs from "fs";

3import os from "os";

4import path from "path";

5import readline from "readline";

6import { fileURLToPath } from "url";

7import { spawnSync } from "child_process";

8import { resolveOpencodeCli } from "../scripts/resolve-opencode-cli.mjs";

High

Child Process

Package source references child process execution.

bin/cli.jsView on unpkg · L6

High

Sandbox Evasion Gated Capability

Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.

bin/cli.jsView on unpkg · L6

9import { listSystemCliCandidates, candidateExists } from "../scripts/cli-detection-utils.mjs";

10import {

11 detectPathShadow,

12 snapshotLangfuseEnv,

13 buildMachinePathPrependScript,

14} from "../scripts/path-shadow-utils.mjs";

15import {

16 DEFAULT_LANGFUSE_BASE_URL,

17 DEFAULT_LANGFUSE_PUBLIC_KEY,

18 DEFAULT_LANGFUSE_SECRET_KEY,

19} from "../scripts/langfuse-defaults.mjs";

20import { normalizeLegacyBaseUrl } from "../scripts/langfuse-url-utils.mjs";

21import {

22 USER_ID_PATTERN,

23 USER_ID_PATTERN_TEXT,

24 normalizeUserId,

25 isValidUserId,

26} from "../scripts/user-id-utils.mjs";

Lines 125-165javascript

125function mask(v) {

126 if (!hasValue(v)) return "<empty>";

127 if (v.length <= 8) return "*".repeat

dsh-langfuse-plugin.jsView file

Lines 609-649javascript

609}

610

611let knownSkillNames = null;

612let knownSkillNamesPromise = null;

613

614async function collectKnownSkillNames() {

615

scripts/update-langfuse-runtime.mjsView file

Lines 120-160javascript

120 baseUrl: process.env.LANGFUSE_BASEURL || process.env.LANGFUSE_HOST,

121 publicKey: process.env.LANGFUSE_PUBLIC_KEY,

122 secretKey: process.env.LANGFUSE_SECRET_KEY,

123 userId: config.userId ||

scripts/codex-langfuse-setup.mjsView file

•Runtime or CLI code links a write operation to an explicit external AI-agent control path: otifykeys.length}. generated content:\n${result}`); } const notifymatch = verifycontent.match(/^notify\s*=\s*\[[\s\s]*?\]/m); if (!notifymatch) { throw new error(`failed to write valid notify config to ${configpath}. generated content:\n${result}`); } } async function main() { const args = parseargs(process.argv.slice(2)); const rootdir = packageroot; const packagejson = json.parse(fs.readfilesync(path.join(rootdir, "package.json"), "utf8")); const publickey = args.publickey || process.env.langfuse_public_key || "pk-lf-da0c90a7-6e93-4eb7-bb86-c1047c8d187d"; const secretkey = args.secretkey || process.env.langfuse_secret_key || "sk[redacted]"; const b

High

External Ai Agent Control Surface Mutation

Runtime or CLI source writes behavior-bearing configuration into a user or project AI-agent control surface.

scripts/codex-langfuse-setup.mjsView on unpkg

codex_langfuse_notify.pyView file

•path = codex_langfuse_notify.py kind = build_helper sizeBytes = 77972 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

codex_langfuse_notify.pyView on unpkg

bin/cli.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 3

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

bin/cli.js#virtual:normalized:round1View on unpkg

Source & flagged code

8 flagged · loading source

bin/cli.jsView file

6import { fileURLToPath } from "url"; L7: import { spawnSync } from "child_process"; L8: import { resolveOpencodeCli } from "../scripts/resolve-opencode-cli.mjs";

High

Child Process

Package source references child process execution.

bin/cli.jsView on unpkg · L6

145const r = isWindowsShellScript L146: ? spawnSync([command, ...args].join(" "), { encoding: "utf8", shell: true }) L147: : spawnSync(command, args, { encoding: "utf8" });

High

Shell

Package source references shell execution.

bin/cli.jsView on unpkg · L145

6import { fileURLToPath } from "url"; L7: import { spawnSync } from "child_process"; L8: import { resolveOpencodeCli } from "../scripts/resolve-opencode-cli.mjs"; ... L61: L62: const colorEnabled = process.stdout.isTTY && process.env.NO_COLOR !== "1"; L63: const ansi = (code) => (colorEnabled ? `\x1b[${code}m` : ""); ... L117: function clearScreen() { L118: if (process.stdout.isTTY) process.stdout.write("\x1b[2J\x1b[H"); L119: } ... L143: function commandExists(command, args = ["--version"]) { L144: const isWindowsShellScript = process.platform === "win32" && /\.(cmd|bat)$/i.test(command); L145: const r = isWindowsShellScript

High

Sandbox Evasion Gated Capability

Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.

Findings

6 High5 Medium5 Low

HighChild Processbin/cli.js

HighShellbin/cli.js

HighSame File Env Network Executionscripts/update-langfuse-runtime.mjs

HighSandbox Evasion Gated Capabilitybin/cli.js

HighExternal Ai Agent Control Surface Mutationscripts/codex-langfuse-setup.mjs

HighSemantic Analysis Limitedbin/cli.js#virtual:normalized:round1

MediumDynamic Requiredsh-langfuse-plugin.js

MediumNetwork

MediumEnvironment Vars

MediumShips Build Helpercodex_langfuse_notify.py

MediumStructural Risk Force Deep Review

LowScripts Present

LowFilesystem

Low

Affected versions and remediation

This report applies to oh-langfuse@1.2.1.

See all versions of oh-langfuse for other recorded verdicts.

Review the evidence and your use of oh-langfuse@1.2.1 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: 2026-10-16 21:00:40.078Z (UTC).

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