u1s1-cli@1.9.1

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AI Security Review

scanned 1mo ago · by lpm-firewall-ai

This is a real lifecycle and agent-extension risk, but the inspected mutations are limited to declared dependencies and the package-owned u1s1 agent directory. The source does not establish malicious exfiltration, destructive behavior, or broad foreign agent control-surface mutation.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

npm installation, then execution of the u1s1 command

Impact

Changes the bundled agent runtime and creates persistent executable extension files; downloaded helpers and updates expand supply-chain exposure.

Mechanism

lifecycle dependency patching and runtime agent-extension generation

AI rationale

Evidence

package.jsonscripts/patch-pi.jsdist/index.jsdist/agent-setup.jsdist/search-tools.jsnode_modules/@earendil-works/pi-coding-agent/dist/modes/interactive/interactive-mode.jsnode_modules/@earendil-works/pi-coding-agent/dist/core/slash-commands.jsnode_modules/@earendil-works/pi-tui/dist/tui-main-screen.js~/.u1s1/agent/extensions/u1s1-tools.js~/.u1s1/agent/bin/fd~/.u1s1/agent/bin/rg

Network endpoints2

api.u1s1.io/v1registry.npmjs.org/u1s1-cli/latest

Decision evidence

public snapshot

AI called this Suspicious at 88.0% confidence as Dangerous Capability with low false-positive risk.

Evidence for warning

The install lifecycle runs a script that rewrites files in the bundled Pi dependencies.
The CLI automatically creates and rewrites executable Pi extension modules under its agent directory.
Startup downloads missing search-tool archives and installs their extracted binaries.
The CLI can automatically install a newer package release after an interactive session ends.

Evidence against

The install patch targets only the package's declared Pi dependencies and consists of UI and translation replacements.
The runtime extensions are written under the package-owned u1s1 agent directory, not a general agent configuration location.
No source path inspected sends harvested environment values or local files to an unrelated endpoint.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStrings

Source & flagged code

16 flagged

package.jsonView file

Lines 10-50json

10 "./embed": {

11 "types": "./dist/embed.d.ts",

12 "default": "./dist/embed.js"

13 },

14 "./package.json": "./package.json"

15 },

16 "files": [

17 "dist",

18 "bench",

19 "scripts"

20 ],

21 "engines": {

22 "node": ">=22.19.0"

23 },

24 "scripts": {

25 "build": "tsc",

26 "dev": "tsx src/index.ts",

27 "typecheck": "tsc --noEmit",

28 "prepublishOnly": "npm run build && npm test",

29 "test": "tsx --test test/*.test.ts && node scripts/render-regression.mjs",

30 "postinstall": "node scripts/patch-pi.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L30

31 "package": "bash ../../scripts/package.sh",

32 "upload-release": "bash ../../scripts/upload-release.sh",

33 "release": "npm run package && npm run upload-release"

34 },

35 "keywords": [

36 "ai",

37 "cli",

38 "coding-agent",

39 "deepseek",

40 "u1s1"

41 ],

42 "license": "MIT",

43 "homepage": "https://u1s1.io",

44 "dependencies": {

45 "@earendil-works/pi-coding-agent": "0.84.4",

46 "@earendil-works/pi-tui": "0.84.4",

47 "typebox": "1.3.7"

48 },

49 "devDependencies": {

50 "@types/node": "^22.20.1",

dist/shell-doctor.jsView file

Lines 1-21javascript

1import { spawn } from "node:child_process";

2import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";

High

Child Process

Package source references child process execution.

dist/shell-doctor.jsView on unpkg · L1

3import { join, win32 } from "node:path";

4import

dist/update.jsView file

Lines 1-29javascript

1import { execFileSync, spawnSync } from "node:child_process";

2import { createHash } from "node:crypto";

3import { mkdtempSync, readFileSync, writeFileSync } from "node:fs";

4import { createRequire } from "node:module";

dist/workflow/runner.jsView file

Lines 1-21javascript

1import { createHash } from "node:crypto";

2import { execFileSync } from "node:child_process";

3import { appendFileSync, existsSync, mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";

Medium

Unsafe Vm Context

Package source executes code through a VM context API.

dist/workflow/runner.jsView on unpkg · L1

dist/index.jsView file

Lines 86-126javascript

86 * TUI 退出后前台安装新版:此刻不再有模型调用和懒加载,重铺 node_modules 才安全。

87 * 不设 timeout——半路杀掉 npm 会留下残缺的全局安装,之后连启动都起不来;

88 * stdio 直通,装多久用户看得见。(同机另开的 u1s1 实例仍会被重铺波及,属残余

89 * 风险,但远好于更新自己脚下这棵树。)

90 */

91function installPendingUpdate

dist/agent-setup.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 2

High

Semantic Analysis Limited

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

dist/agent-setup.js#virtual:normalized:round1View on unpkg

dist/search-tools.jsView file

•matchType = normalized_sha256 matchedPackage = u1s1-cli@1.8.1 matchedPath = dist/search-tools.js matchedIdentity = npm:dTFzMS1jbGk:1.8.1 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.

dist/search-tools.jsView on unpkg

scripts/patch-pi.jsView file

•matchType = normalized_sha256 matchedPackage = u1s1-cli@1.8.1 matchedPath = scripts/patch-pi.js matchedIdentity = npm:dTFzMS1jbGk:1.8.1 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.

scripts/patch-pi.jsView on unpkg

dist/secret-env.jsView file

•matchType = normalized_sha256 matchedPackage = u1s1-cli@1.8.1 matchedPath = dist/secret-env.js matchedIdentity = npm:dTFzMS1jbGk:1.8.1 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.

dist/secret-env.jsView on unpkg

dist/error-humanize.jsView file

•matchType = normalized_sha256 matchedPackage = u1s1-cli@1.8.1 matchedPath = dist/error-humanize.js matchedIdentity = npm:dTFzMS1jbGk:1.8.1 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.

dist/error-humanize.jsView on unpkg

dist/config.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = u1s1-cli@1.9.0 matchedIdentity = npm:dTFzMS1jbGk:1.9.0 similarity = 0.833 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

dist/config.jsView on unpkg

Source & flagged code

16 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/patch-pi.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

dist/shell-doctor.jsView file

1import { spawn } from "node:child_process"; L2: import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";

High

Child Process

Package source references child process execution.

dist/shell-doctor.jsView on unpkg · L1

142console.error(" ⚠ 未找到 Git Bash,将使用 WSL 的 bash:命令会在 WSL 的 Linux 里执行,不是 Windows 本机。"); L143: console.error(" 建议安装 Git for Windows(PowerShell 运行: winget install --id Git.Git)后重启 u1s1。"); L144: }

High

Shell

Package source references shell execution.

dist/shell-doctor.jsView on unpkg · L142

Findings

13 High5 Medium6 Low

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processdist/shell-doctor.js

HighShelldist/shell-doctor.js

HighSame File Env Network Executiondist/index.js

HighCredential Redirect Persistencedist/index.js

HighSandbox Evasion Gated Capabilitydist/update.js

HighSemantic Analysis Limiteddist/agent-setup.js#virtual:normalized:round1

HighKnown Malware Source Similaritydist/update.js

HighKnown Malware Source Similaritydist/search-tools.js

HighKnown Malware Source Similarityscripts/patch-pi.js

HighKnown Malware Source Similaritydist/secret-env.js

High

Affected versions and remediation

This report applies to u1s1-cli@1.9.1.

See all versions of u1s1-cli for other recorded verdicts.

Review the evidence and your use of u1s1-cli@1.9.1 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: 2026-09-12 10:54:32.499Z (UTC).

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