Inquiry Regarding Cloudflare Blocking When Submitting npm Malware Reports

[Alanxtl]

🏷️ Discussion Type

Question

Body

Inquiry Regarding Cloudflare Blocking When Submitting npm Malware Reports

Hello npm Security Team,

I am a security researcher who regularly reports malicious packages and suspicious activity on npm. Recently, I have noticed that when I try to submit malware reports through the npm reporting workflow, my requests are blocked by Cloudflare.

I would like to ask whether this behavior is expected, and whether there is any recommended way for researchers like me to avoid being mistakenly blocked while submitting legitimate security reports.

For context, I have been actively reporting malicious packages to npm, and I have already received 48 email confirmations indicating that my submitted reports were reviewed and resolved. This suggests that my reports are legitimate and useful to the ecosystem, so I am concerned that the Cloudflare blocking may prevent me from continuing to submit timely reports.

Could you please help me understand:

1. Why my report submissions may be triggering Cloudflare blocking?
2. Whether my account, IP address, or reporting pattern can be reviewed?
3. Whether there is a preferred channel or allowlisting process for frequent security researchers submitting npm malware reports?
4. What information I should provide to help investigate this issue, such as timestamps, Ray IDs, screenshots, or blocked URLs?

I am happy to provide examples of the Cloudflare block pages, including Ray IDs and submission times, if needed.

Thank you for your time and for your work protecting the npm ecosystem. I would appreciate any guidance that helps ensure legitimate security reports can continue to be submitted smoothly.

Best regards,
Xuetao Li
Github username: Alanxtl
NPM username: m134679102365478
email: "Personal info edited by staff"

[Arijit1822]

Based on what you've shared, I don't think npm is intentionally blocking security researchers. This looks more like Cloudflare's automated protection flagging something about the request rather than the report itself.

A few possibilities come to mind:

• The request rate may be triggering anti-abuse rules if you're submitting multiple reports within a short period.
• A VPN, proxy, or datacenter IP could have a poor reputation.
• Certain URLs or package names included in malware reports might match security rules.
• Browser extensions or privacy settings could also be affecting the request.

Since you've already had many reports successfully reviewed and resolved, that suggests your account has a history of legitimate submissions, so I'd be surprised if this were related to trust in the reporter.

If you continue seeing the block, I'd recommend collecting the Cloudflare Ray ID, timestamp, browser information, and whether you were using a VPN or residential connection. Those details should help the npm team trace the specific Cloudflare event and determine which rule is being triggered.

I'm not aware of a public allowlist for frequent reporters, but if this is a recurring false positive, hopefully the security team can review the Cloudflare logs and either adjust the rule or suggest a more reliable reporting path.

Thanks for taking the time to report malicious packages—it's an important contribution to the ecosystem.

[Dasmat13]

This is a known friction point for security researchers. Here is how to work around the Cloudflare block and get your malware reports through:

Why Cloudflare blocks security researchers

Cloudflare's WAF (Web Application Firewall) sometimes flags security-related content in form submissions — package names, malicious URLs, shellcode snippets, etc. — as attacks, blocking the submission. This is a false positive triggered by the content of your report.

Workarounds

Option 1: Use the npm security email (most reliable)

Send your report directly to the npm security team:

security@npmjs.com

This bypasses all web forms. Use this format:

• Subject: [SECURITY] Malicious package: <package-name>
• Body: Package name, version, link, description of malicious behavior, evidence

Option 2: Use GitHub's security advisory form

Since npm is owned by GitHub, you can also report via:

https://github.com/advisories/new

Option 3: Reduce WAF trigger content

If you must use the web form:

• Avoid pasting raw malicious code — describe it instead
• Use [dot] instead of . in malicious URLs (e.g., evil[dot]com)
• Submit evidence as an attached file rather than inline text

Option 4: Use a VPN or different network

Cloudflare blocks are sometimes IP-reputation based. Switching networks may help.

Option 5: npm abuse report form

Try the direct abuse report URL:

https://www.npmjs.com/support

Select "Report a package" from the category dropdown.

Thank you for contributing to npm ecosystem security — these reports are genuinely valuable! 🛡️

[mesanda456]

Thank you for your efforts in reporting malicious npm packages and helping improve the security of the ecosystem.

A Cloudflare block doesn't necessarily mean your account has been restricted. In many cases, it can be triggered by automated security rules based on factors such as request frequency, browser configuration, VPN/proxy usage, IP reputation, or unusual traffic patterns.

To help the npm Security team investigate, I'd recommend providing:

The Cloudflare Ray ID shown on the block page.
The approximate date and time the block occurred (including your time zone).
Your public IP address (if you're comfortable sharing it privately with support).
Whether you were using a VPN, proxy, or automation tools.
The URL you were attempting to access and the steps that consistently reproduce the issue.

Since you've successfully submitted many legitimate malware reports in the past, mentioning your history of accepted reports is useful context. The npm team may be able to determine whether this is a false positive and advise whether an allowlist or another reporting method is available for trusted researchers.

Hopefully they can review the Cloudflare logs associated with the Ray IDs and identify why your requests are being blocked.