@readystack/hmrc-fraud-prevention-header-lint
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.
This report shows the evidence for @readystack/hmrc-fraud-prevention-header-lint@0.1.6. 0 of 5 known versions are blocked or flagged. See all versions.
AI Security Review
scanned 4d ago · by lpm-firewall-aiThe CLI sends minimal usage events to the vendor during ordinary interactive use, but the README does not disclose this telemetry. The payloads contain no credentials or project data, so the finding warrants a warning rather than a publish block.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
A free CLI scan in an interactive terminal, or a missing or invalid license in an eligible session.
Impact
The vendor can observe usage and license-prompt events; the reviewed event payloads do not include project or credential data.
Mechanism
POSTs event type, package slug, source, and reason to the vendor’s /api/ev endpoint.
AI rationale
The CLI sends minimal usage events to the vendor during ordinary interactive use, but the README does not disclose this telemetry. The payloads contain no credentials or project data, so the finding warrants a warning rather than a publish block.
Evidence
cli.jslicense.jsREADME.md
Network endpoints1
getreadystack.com/api/ev
Decision evidence
public snapshotAI called this Suspicious at 91.0% confidence as Dangerous Capability with medium false-positive risk.
Evidence for warning
- After a free CLI run, an interactive terminal can trigger a POST to getreadystack.com/api/ev containing the package slug, CLI source, and a free-use event.
- When a license is missing or invalid, the CLI can POST the event type, package slug, source, and reason to the same endpoint.
- The README describes free checks as offline but does not disclose these usage events.
Evidence against
- The events contain no file contents, credentials, hostname, or username.
- The usage events are skipped in CI and non-interactive sessions and can be disabled with DO_NOT_TRACK or READYSTACK_NO_TELEMETRY.
- License validation and rules-feed requests use a product license key in the package’s licensing flow.
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...
...
L33: 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...
...
L33
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@0.1.6.
The versions list below shows the verdict for each recorded version.
- Review the evidence and your use of @readystack/hmrc-fraud-prevention-header-lint@0.1.6 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: .
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