Skills/npm/penthera

penthera@2.4.0

CAUTION· install only

Publisher claims: "Offline cyber security agent for your apps and AI coding tools. Open R&D: measured in public, improved every release." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher danoszz · publishing for 91 daysInstalls 4,952Last detonated 4d ago
What would fix thisWatchDispute verdict

Coverage

Nothing executable in the bundle ran; the trace covers the install step only.
Tested
every file read, file written and host contacted by what ran
Not tested
use of the skill by an agent

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (1 scenario; nothing executable in the bundle ran; the trace covers the install step only) on 2026-11-10 and scored it 68/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: URL to the cloud instance metadata address; URL to the cloud instance metadata address; URL to the cloud instance metadata address. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 0 s · 1 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.0sprocessscript backend runs setup only
0.0sprocessscript backend runs setup only
0.0sprocessno install scripts to re-run

Static findings

CRITICAL
URL to the cloud instance metadata addresslib/injections.js:306 · URL to the cloud instance metadata address — reads the VM's credentials{ url: "http://169.254.169.254/latest/meta-data/", name: "AWS metadata" },Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST07
CRITICAL
URL to the cloud instance metadata addresslib/injections.js:308 · URL to the cloud instance metadata address — reads the VM's credentials{ url: "http://169.254.169.254/metadata/instance?api-version=2021-02-01", name: "Azure metadata" },Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST07
CRITICAL
URL to the cloud instance metadata addresslib/fuzzer.js:70 · URL to the cloud instance metadata address — reads the VM's credentials"https://169.254.169.254/latest/meta-data/", // SSRFFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST07
MEDIUM
npx invocation of non-well-known packagesrc/card/model.js:184 · npx invocation of non-well-known package — may execute untrusted codereturn "npx penthera --card";Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Hidden zero-width characters detectedlib/fix/apply.js:42 · Hidden zero-width characters detected — may conceal contentconst IGNORABLE = /[​-‏‪-‮⁠-⁤-]/g;Fix: Keep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
AST07
HIGH
URL with embedded credentialssrc/card/model.js:38 · URL with embedded credentials — may be phishing or credential leaking* (`pkg@https://user:pw@host/pkg.tgz?token=x`, `file:/Users/me/x.tgz`), so:Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST07
HIGH
Hidden zero-width characters detectedlib/fix/apply.js:41 · Hidden zero-width characters detected — may conceal content// Code points HFS+ ignores in names, so ".g‌it" is ".git" on macOS (CVE-2014-9390).Fix: Keep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
AST07
HIGH
Access to sensitive file pathslib/fix/util.js:350 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files/** Add `NAME=value` to .env.example (creating it) unless NAME is already listed. */Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathslib/templates.js:256 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files// .env: lib/rules/core/templates.json.Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathslib/fuzzer.js:44 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"file:///etc/passwd", // file URLFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathslib/templates.js:260 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesinfo: { name: ".env.local file exposed", severity: "critical", tags: ["exposure", "config"] },Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Process kill commandsrc/cli/agent.js:148 · Process kill command — agent can terminate processes// A kill leaves no second chance: put back the fix in flight, then go.Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Access to sensitive file pathslib/git.js:33 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesexport const safeEnv = (env = process.env) => ({ ...env, GIT_NO_LAZY_FETCH: "1", GIT_TERMINAL_PROMPT: "0" });Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathslib/injections.js:339 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files/root:.*:0:0/, // /etc/passwdFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/scan-url.js:354 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files{ path: "/.env.production", severity: "critical", desc: "Production environment secrets" },Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagelib/hook/index.js:369 · npx invocation of non-well-known package — may execute untrusted code* the repo, and through the installing Node. npx runs from /, with every npm_config_*Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathslib/crawler.js:74 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"/.env", "/.env.local", "/.env.production",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagesrc/cli/hook.js:40 · npx invocation of non-well-known package — may execute untrusted codehusky: echo "npx --no-install penthera hook run" >> .husky/pre-commitFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagelib/hook/index.js:401 · npx invocation of non-well-known package — may execute untrusted codeif command -v npx >/dev/null 2>&1; thenFix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathslib/fix/index.js:353 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst SETTING = /^(\s*(?:export\s+)?[\w.-]+\s*[=:]\s*)\S.*$/; // .env, shell and YAMLFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagesrc/card/model.js:183 · npx invocation of non-well-known package — may execute untrusted codeif (modes.size === 1 && modes.has("agents")) return "npx penthera agents --card";Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagelib/hook/index.js:408 · npx invocation of non-well-known package — may execute untrusted codeif HOME="$account_home" npx --registry=https://registry.npmjs.org/ --cache="$account_home/.npm" -y ${pkg} --version >/dev/null 2>&1; thenFix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Bidirectional text override characters detectedlib/fix/apply.js:42 · Bidirectional text override characters detected — may hide content directionconst IGNORABLE = /[​-‏‪-‮⁠-⁤-]/g;Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
HIGH
Direct script execution from GitHub raw URLlib/retirejs.js:27 · Direct script execution from GitHub raw URL — unverified code source"https://raw.githubusercontent.com/RetireJS/retire.js/master/repository/jsrepository.json",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Bidirectional text override characters detectedlib/rules/pack.js:53 · Bidirectional text override characters detected — may hide content directionconst UNSAFE_TEXT = /[\u0000-\u001f\u007f-\u009f‪-‮⁦-⁩]/;Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
HIGH
Access to sensitive file pathslib/templates.js:262 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesmethod: "GET", path: "/.env.local",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Privileged sudo commandlib/machine.js:635 · Privileged sudo command — agent may execute with elevated privilegesconst out = run("sudo rkhunter --check --sk --rwo 2>/dev/null", { timeout: 120_000 });Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Access to sensitive file pathslib/fix/util.js:357 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesreturn { file: ".env.example", before, after };Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/cli.js:257 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files* .env file), and likely noise and info are not problems. It never fails aFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Privileged sudo commandlib/machine.js:632 · Privileged sudo command — agent may execute with elevated privilegesrun("sudo rkhunter --propupd 2>/dev/null", { timeout: 60_000 });Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
npx invocation of non-well-known packagelib/hook/index.js:362 · npx invocation of non-well-known package — may execute untrusted code* is gone (an npx cache cleaned, a version change), a global `penthera`, thenFix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathslib/fuzzer.js:43 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"../../../etc/passwd", // path traversalFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathslib/fuzzer.js:79 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"../../../etc/passwd", "..%2f..%2f..%2f",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Hidden zero-width characters detectedlib/retirejs.js:9 · Hidden zero-width characters detected — may conceal content* 2. File content pattern matching (/*! jQuery v3.5.1 *​/)Fix: Keep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
AST07
HIGH
Access to sensitive file pathslib/fix/util.js:352 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst before = readText(repoPath, ".env.example");Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Bidirectional text override characters detectedsrc/cli/verify.js:50 · Bidirectional text override characters detected — may hide content directionconst CONTROL = /[\u0000-\u001f\u007f-\u009f‎‏‪-‮⁦-⁩]/g;Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
MEDIUM
npx invocation of non-well-known packagelib/hook/index.js:409 · npx invocation of non-well-known package — may execute untrusted codeHOME="$account_home" exec npx --registry=https://registry.npmjs.org/ --cache="$account_home/.npm" -y ${pkg} hook run --repo "$top"Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagesrc/reporter.js:574 · npx invocation of non-well-known package — may execute untrusted codeelse w(` ${c.dim("Next:")} npx penthera ui --open, then Check my app ${c.dim("to go through every problem")}`);Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagesrc/cli/mcp.js:16 · npx invocation of non-well-known package — may execute untrusted codeclaude mcp add penthera -- npx -y penthera@<version> mcpFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagesrc/cli/hook.js:41 · npx invocation of non-well-known package — may execute untrusted codelefthook: pre-commit: { commands: { penthera: { run: npx --no-install penthera hook run } } }Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commandsrc/cli/ui.js:114 · Process kill command — agent can terminate processes// terminal or a process-group kill delivered it. Keep listening and ignoreFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Process kill commandsrc/cli/ui.js:116 · Process kill command — agent can terminate processes// and kill the process before it stops. The caller exits as soon as thisFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
File type combined with upload actionsrc/cli/hook.js:111 · File type combined with upload action — agent may exfiltrate local data filesif (r.chained) console.log(` ${dim("▸")} Your existing hook moved to ${rel(r.chained)} and runs first; \`penthera hook uninstall\` puts it back.`);Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
npx invocation of non-well-known packagesrc/cli.js:64 · npx invocation of non-well-known package — may execute untrusted codeconst p = process.env.npm_command === "exec" ? "npx penthera" : "penthera";Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commandsrc/cli/ui.js:111 · Process kill command — agent can terminate processes// arrives between the two would otherwise get the default action and killFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05

Cost to the agent

Instructions loaded
≈53 tok
1 file · 81 in bundle

Tokens estimated at four characters each. Skills load their instruction text when triggered; the figure is what that costs.

Known vulnerabilities

No advisories in OSV for penthera@2.4.0 as of 4d ago. This is the package itself, not its dependencies.

What would make this Verified

12 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. URL to the cloud instance metadata address≈ +9 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  2. Unclaimed publisher≈ +8 on the totalClaim danoszz: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  3. Hidden zero-width characters detected≈ +4 on the totalKeep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
  4. URL with embedded credentials≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  5. Access to sensitive file paths≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  6. Bidirectional text override characters detected≈ +4 on the totalReplace encoded or assembled strings with plain literals and remove undeclared network calls.
Publish a new version to npm, then queue it here. Not your skill? Claim the handle to get verdict changes by email.Claim danoszzPropose a patch to the maintainer