@readystack/hmrc-fraud-prevention-header-lint@0.1.5
Not affiliated with ReadyStack (readystack.dev). No new versions are published here. These tools continue under the name Rulestamp, by the team behind getreadystack.com.
Finds the Gov-Client and Gov-Vendor header mistakes HMRC rejects, in your editor, offline, before you send the request.
AI Security Review
scanned 4d ago · by lpm-firewall-aiThe CLI sends a default usage event to the package vendor during interactive free runs, and the README does not disclose it. The event is limited to product usage fields and has opt-out controls, so this warrants a warning rather than a malicious verdict.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
Running a free CLI check from an interactive terminal, unless telemetry is disabled or CI is set.
Impact
The vendor receives a record that the tool was used; no credentials, project data or file contents are included in this event.
Mechanism
The CLI posts a usage event containing the package slug, source and reason to getreadystack.com/api/ev.
AI rationale
The CLI sends a default usage event to the package vendor during interactive free runs, and the README does not disclose it. The event is limited to product usage fields and has opt-out controls, so this warrants a warning rather than a malicious verdict.
Evidence
cli.jslicense.js
Network endpoints2
getreadystack.com/api/evapi.polar.sh/v1/customer-portal/license-keys/validate
Decision evidence
public snapshotAI called this Suspicious at 94.0% confidence as Dangerous Capability with medium false-positive risk.
Evidence for warning
- An interactive free CLI run sends a usage event to getreadystack.com by default; users can disable it with DO_NOT_TRACK=1 or READYSTACK_NO_TELEMETRY.
- The event contains only the event type, package slug, CLI/MCP source and reason; the README describes the free and licensed features but does not disclose this telemetry.
Evidence against
- The usage event is limited to product usage fields and only runs in an interactive terminal; CI and non-interactive runs are excluded.
- License validation sends a user-provided license key to Polar's license-validation endpoint, consistent with the documented paid license feature.
Behavioral surface
EnvironmentVarsFilesystemNetwork
HighEntropyStringsUrlStrings
NoLicense
Source & flagged code
5 flaggedlicense.jsView file
2'use strict';
L3: const https = require('https'), fs = require('fs'), path = require('path'), os = require('os');
L4: const ORG_ID = 'a5cdf664-d8e7-4f87-8895-056717aaba17';
...
L9: const RECHECK_MS = 7 * 24 * 3600 * 1000; // re-ask Polar every 7 days (refunds / cancellations)
L10: function storePath() { return path.join(process.env.READYSTACK_HOME || path.join(os.homedir(), '.config', 'readystack'), SLUG + '.json'); }
L11: function load() { try { return JSON.parse(fs.readFileSync(storePath(), 'utf8')); } catch (e) { return {}; } }
L12: function save(o) { try { fs.mkdirSync(path.dirname(storePath()), { recursive: true }); fs.writeFileSync(storePath(), JSON.stringify(o)); } catch (e) { /* read-only home: still work...
...
L31: req.on('error', function () { resolve({ ok: false, offline:
Critical
Credential Exfiltration
Source appears to send environment or credential material to an external endpoint.
license.jsView on unpkg · L22Trigger-reachable chain: manifest.bin -> cli.js -> license.js
L2: 'use strict';
L3: const https = require('https'), fs = require('fs'), path = require('path'), os = require('os');
L4: const ORG_ID = 'a5cdf664-d8e7-4f87-8895-056717aaba17';
...
L9: const RECHECK_MS = 7 * 24 * 3600 * 1000; // re-ask Polar every 7 days (refunds / cancellations)
L10: function storePath() { return path.join(process.env.READYSTACK_HOME || path.join(os.homedir(), '.config', 'readystack'), SLUG + '.json'); }
L11: function load() { try { return JSON.parse(fs.readFileSync(storePath(), 'utf8')); } catch (e) { return {}; } }
L12: function save(o) { try { fs.mkdirSync(path.dirname(storePath()), { recursive: true }); fs.writeFileSync(storePath(), JSON.stringify(o)); } catch (e) { /* read-only home: still work...
...
L31
Findings
3 Critical2 High3 Medium4 Low
CriticalCredential Exfiltrationlicense.js
CriticalTrigger Reachable Dangerous Capabilitylicense.js
CriticalPrevious Version Dangerous Deltacli.js
HighSandbox Evasion Gated Capabilitylicense.js
HighTrigger Reachable Credential Exfiltrationlicense.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
LowNo License
Affected versions and remediation
This report applies to @readystack/hmrc-fraud-prevention-header-lint@0.1.5.
See all versions of @readystack/hmrc-fraud-prevention-header-lint for other recorded verdicts.
- Review the evidence and your use of @readystack/hmrc-fraud-prevention-header-lint@0.1.5 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.