registry / Credential exfiltration / @cachly-dev/mcp-server / 0.10.127

@cachly-dev/mcp-server@0.10.127

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AI Security Review

scanned 2mo ago · by lpm-firewall-ai

No unconsented install-time control-surface mutation was found, so the source does not support a block verdict. Sending an active credential in opt-out telemetry is a concrete unresolved credential-handling risk.

Static reason

One or more suspicious static signals were detected.; previous stored version diff introduced dangerous source

Trigger

MCP runtime telemetry or user invocation of init/setup/autopilot

Impact

API credential disclosure to the vendor telemetry endpoint and persistent automatic agent behavior after user-requested setup

Mechanism

JWT-bearing telemetry and explicit agent-extension provisioning

AI rationale

Evidence

package.jsonscripts/postinstall.jsdist/src/index.jsdist/src/ambient-hooks.jsdist/src/cls-hook.js.mcp.json.cursor/mcp.json.vscode/mcp.json~/.claude/mcp.jsonCLAUDE.mdAGENTS.md.github/copilot-instructions.md.claude/settings.json.claude/hooks/cachly-ambient-session-start.mjs.git/hooks/post-commit

Network endpoints2

api.cachly.dev/api/v1/telemetry/mcpauth.cachly.dev/realms/cachly/protocol/openid-connect

Decision evidence

public snapshot

AI called this Suspicious at 90.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

Telemetry posts the active JWT in its request body to the Cachly API.
Explicit init/setup commands write cross-agent instruction files, MCP configuration, Claude hooks, and a git post-commit hook.

Evidence against

The postinstall script only prints an opt-in autopilot command; it performs no mutation.
Agent-control writes are gated behind explicit init/setup/autopilot CLI commands, not npm installation.
Observed endpoints are Cachly-owned API/auth hosts consistent with the package service.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsEvalFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 68 file(s), 1.40 MB of source, external domains: aistudio.google.com, api.cachly.dev, api.cohere.com, api.mistral.ai, api.openai.com, api.telegram.org, auth.cachly.dev, cachly.dev, console.mistral.ai, dashboard.cohere.com, generativelanguage.googleapis.com, platform.openai.com, registry.npmjs.org, twitter.com

Source & flagged code

14 flagged

package.jsonView file

Lines 16-56json

16 "cachly-mcp": "dist/src/index.js"

17 },

18 "main": "./dist/src/index.js",

19 "scripts": {

20 "count-tools": "node scripts/count-tools.mjs",

21 "tool-catalog": "node scripts/tool-catalog.mjs summary",

22 "tool-catalog:json": "node scripts/tool-catalog.mjs json",

23 "tool-catalog:markdown": "node scripts/tool-catalog.mjs markdown",

24 "capability-docs": "node scripts/capability-docs.mjs markdown",

25 "capability-docs:write": "node scripts/capability-docs.mjs write",

26 "verify-capability-docs": "node scripts/capability-docs.mjs check",

27 "docs-atlas": "node scripts/docs-atlas.mjs summary",

28 "docs-atlas:write": "node scripts/docs-atlas.mjs write",

29 "verify-docs-atlas": "node scripts/docs-atlas.mjs check",

30 "tool-spec-snapshots:write": "node scripts/tool-spec-snapshots.mjs write",

31 "version": "node scripts/nummer-nachziehen.mjs && npm run tool-spec-snapshots:write",

32 "verify-tool-spec-snapshots": "node scripts/tool-spec-snapshots.mjs check",

33 "verify-tool-counts": "node scripts/verify-tool-counts.mjs",

34 "verify-capabilities": "node scripts/verify-capabilities.mjs",

35 "build": "tsc && node scripts/bauabdruck.mjs",

36 "postinstall": "node scripts/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L36

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L36

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

38 "start": "node dist/src/index.js",

39 "test": "vitest run",

40 "test:watch": "vitest",

41 "bench": "tsx src/bench/cachly-bench.ts",

42 "bench:external": "tsx src/bench/external-corpus.ts",

43 "bench:onboarding": "tsx src/bench/onboarding-bench.ts",

44 "bench:gate": "tsx src/bench/gate.ts",

45 "test:e2e": "bash scripts/e2e-run.sh",

46 "test:e2e:api": "bash scripts/e2e-run.sh api",

47 "test:e2e:cli": "bash scripts/e2e-run.sh cli",

48 "test:e2e:tools": "bash scripts/e2e-run.sh tools",

49 "test:e2e:funnel": "bash scripts/e2e-run.sh funnel",

50 "test:e2e:provisioning": "bash scripts/e2e-run.sh provisioning",

51 "lint": "eslint src",

52 "typecheck": "tsc --noEmit",

53 "bench:cost": "tsx src/bench/cost.ts"

54 },

55 "dependencies": {

56 "@modelcontextprotocol/sdk": "^1.10.0",

dist/src/bench/cachly-bench.jsView file

Lines 20-60javascript

20import { rerankByQuality } from '../rerank.js';

21import { BENCH_LESSONS, BENCH_QUERIES } from './fixtures.js';

22const LESSON_PREFIX = 'cachly:lesson:best:';

23// ── Minimal in-memory Redis (only what keywordSearch needs) ──────────────────

dist/src/ambient-hooks.jsView file

Lines 48-88javascript

48 const cli = opts.cliCommand ?? DEFAULT_CLI;

49 return [

50 `#!/usr/bin/env node`,

51 `// cachly Ambient Recall — ${event} ${AMBIENT_HOOK_VERSION}`

dist/src/tools.jsView file

Lines 2313-2353javascript

2313 'Example: brain_share(instance_id="...", title="My Auth Patterns", topic_filter=["auth"])',

2314 inputSchema: {

2315 type: 'object',

2316 properties: {

2317 instance_id: { type: 'string',

dist/src/confidence.jsView file

Lines 1-22javascript

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

2// ── Confidence Decay Config ───────────────────────────────────────────────────

3export const CONFIDENCE_WARN_DAYS = Number(process.env.CACHLY_CONFIDENCE_WARN_DAYS ?? 5);

dist/src/handlers/cache.jsView file

Lines 12-52javascript

12 'cache_stats', 'semantic_search', 'detect_namespace', 'cache_warmup', 'index_project',

13 'cache_mset', 'cache_mget', 'cache_lock_acquire', 'cache_lock_release',

14 'cache_stream_set', 'cache_stream_get'

dist/src/index.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = @cachly-dev/mcp-server@0.10.124 matchedIdentity = npm:QGNhY2hseS1kZXYvbWNwLXNlcnZlcg:0.10.124 similarity = 0.851 summary = stored previous version shares package body but lacks this dangerous source file

Critical

Previous Version Dangerous Delta

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

dist/src/index.jsView on unpkg

•Manifest-reachable source captures an API credential, sends it to a fixed unofficial gateway, and persists that redirection in agent or shell configuration. dist/src/index.js: headers: { Authorization: `Bearer ${JWT}`, 'Content-Type': 'application/json' }, headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${JWT}` }, headers: { Authorization: `Bearer ${JWT}`, Accept: 'application/json' }, // When the credential is near expiry we mint a fresh long-lived API key *while the /** Persist a (possibly refreshed) API key to ~/.claude/mcp.json so restarts keep it. const { writeFile, mkdir, readFile } = await import('node:fs/promises'); // Primary config: create or update ~/.claude/mcp.json const claudePath = resolve(home, '.claude', 'mcp.json');

High

Credential Redirect Persistence

Manifest-reachable source sends a prompted API credential to a fixed unofficial gateway and persists the redirection.

dist/src/index.jsView on unpkg

•Manifest-reachable source resolves another installed package, overwrites its runtime code, and injects package-defined remote behavior. dist/src/index.js: * CACHLY_API_URL – default https://api.cachly.dev let API_URL = process.env.CACHLY_API_URL ?? 'https://api.cachly.dev'; const { writeFile, mkdir, readFile } = await import('node:fs/promises'); await writeFile(claudePath, JSON.stringify(cfg, null, 2), 'utf-8'); await writeFile(p, JSON.stringify(sc, null, 2), 'utf-8'); const { writeFile, readFile } = await import('node:fs/promises'); await writeFile(p, JSON.stringify(cfg, null, 2), 'utf-8'); // window *title*, so `start "https://…"` opens an empty console window instead of the

dist/src/cls-hook.jsView file

69"files:(process.env.CLS_FILES||'').split(',').filter(Boolean)}};" + L70: "require('child_process').execFileSync('npx',['@cachly-dev/mcp-server@latest','cls-ingest',JSON.stringify(p)]," + L71: "{stdio:'ignore',timeout:8000});" +

High

Runtime Package Install

Package source invokes a package manager install command at runtime.

dist/src/cls-hook.jsView on unpkg · L69

Source & flagged code

14 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node scripts/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

dist/src/bench/cachly-bench.jsView file

40get(key) { cmds.push(key); return this; }, L41: async exec() { L42: return cmds.map(k => [null, store.get(k) ?? null]);

High

Child Process

Package source references child process execution.

dist/src/bench/cachly-bench.jsView on unpkg · L40

Findings

1 Critical10 High5 Medium6 Low

CriticalPrevious Version Dangerous Deltadist/src/index.js

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processdist/src/bench/cachly-bench.js

HighShelldist/src/ambient-hooks.js

HighCredential Exfiltrationdist/src/handlers/cache.js

HighCredential Redirect Persistencedist/src/index.js

HighEntrypoint Foreign Package Code Overwritedist/src/index.js

HighExternal Ai Agent Control Surface Mutationdist/src/index.js

HighTrigger Reachable External Ai Agent Control Surface Mutationdist/src/index.js

HighTrigger Reachable Credential Exfiltrationdist/src/handlers/cache.js

HighRuntime Package Install

Affected versions and remediation

This report applies to @cachly-dev/mcp-server@0.10.127.

See all versions of @cachly-dev/mcp-server for other recorded verdicts.

Review the evidence and your use of @cachly-dev/mcp-server@0.10.127 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: 2026-08-21 11:44:59.058Z (UTC).

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

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Runtime surface

Behavioral surface

Source & flagged code