Overview
Findings
Actions
Details
Related
AI-Generated Summary
What this means
bun.sh scored 68/100, meeting baseline requirements but with 2 findings that require attention. The vendor can proceed with a remediation timeline agreement.
Critical gaps in: Security Headers, DMARC / Email Security. Positive signals: Known Breaches, TLS Configuration, HSTS Header all passed.
4 action items identified, including 1 critical. The issues are configuration gaps, not architectural problems. A focused remediation effort of 2–5 days could address all findings.
How bun.sh compares
Grade distribution across 2378 companies we've scanned. bun.sh scores better than 38% of them.
71
A+
22
A
180
A-
181
B+
69
B
333
B-
111
C+
111
C
295
C-
110
D+
92
D
216
D-
587
F
bun.sh — Grade D+ (68/100)
2378 companies scanned
Security checks
Each check inspects a different part of bun.sh's public security setup. Green means healthy, yellow needs attention, red is a problem.
Security Headers
Only 0/5 security headers present. Missing: CSP, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy. This exposes the application to clickjacking, MIME-sniffing, and other client-side attacks.
DMARC / Email Security
Strengths: SPF record present with soft-fail (~all). Issues: No DMARC record found — email spoofing is not prevented; No DKIM records found for common selectors (domain may use custom selectors — this is not a confirmed gap).
DNS Configuration
Strengths: 2 nameservers configured (hans.ns.cloudflare.com., naomi.ns.cloudflare.com.); 5 MX records present; Zone transfers properly restricted. Issues: DNSSEC not configured — DNS responses can be spoofed.
Certificate Hygiene
Strengths: Certificate valid, 41 days remaining; Issued by Google Trust Services. Issues: Wildcard certificate in use — broader attack surface if compromised.
Known Breaches
No known breaches found in public disclosure databases.
TLS Configuration
TLSv1.3 negotiated with TLS_AES_256_GCM_SHA384 (256-bit). Strong configuration with no deprecated protocols or weak ciphers detected.
HSTS Header
HSTS enabled: max-age=63072000. Missing includeSubDomains. Missing preload directive.
CVE Exposure
Detected technologies: cloudflare. (cloudflare detected but excluded from CVE matching — upstream infrastructure). All detected technologies are upstream CDN/proxy infrastructure. No application-level software versions exposed.
Recommended actions
4 items
Steps to improve bun.sh's security grade, ranked by impact.
1
Set up email authentication (DMARC, DKIM)
Without email authentication, anyone can send emails that appear to come from bun.sh. This is the most common vector for phishing attacks targeting employees and customers. DMARC, DKIM are not configured.
Compliance impact
NIST CSFPR.AC-7
Email authentication is a required access control
ISO 27001A.13.2.1
Information transfer policies require email security controls
HIPAA§164.312(e)
Transmission security for electronic PHI
How to fix this
1
Add SPF record to DNS: v=spf1 include:_spf.google.com ~all (adjust for your email provider)
2
Configure DKIM signing with your email provider and publish the public key in DNS
3
Add DMARC record: v=DMARC1; p=quarantine; rua=mailto:[email protected]
4
Monitor DMARC reports for 2–4 weeks, then upgrade policy to p=reject
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2
Add missing security headers (CSP, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy)
5 of 5 recommended security headers are missing on bun.sh: CSP, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy. These headers protect against clickjacking, MIME-sniffing, and unauthorized browser feature access. Adding them is a server configuration change with no application code changes required.
Compliance impact
PCI-DSS 4.0Req 6.4.1
Security headers are required application controls
OWASPSecure Headers
Recommended baseline for web applications
How to fix this
1
Add Content-Security-Policy header (start with report-only to avoid breakage)
2
Add: X-Content-Type-Options: nosniff
3
Add: X-Frame-Options: DENY (or SAMEORIGIN if you use iframes)
4
Add: Referrer-Policy: strict-origin-when-cross-origin
5
Add: Permissions-Policy: camera=(), microphone=(), geolocation=()
6
Verify with: curl -sI https://bun.sh | grep -iE 'content-security|x-frame|x-content|referrer|permissions'
3
Enable DNSSEC on your domain
Without DNSSEC, DNS responses for bun.sh can be spoofed, potentially redirecting users to malicious sites. This requires coordination with your domain registrar to publish DS records.
Compliance impact
NIST 800-53SC-20
Secure name/address resolution service
How to fix this
1
Check if your DNS provider supports DNSSEC (Cloudflare, Route53, etc.)
2
Enable DNSSEC signing in your DNS provider dashboard
3
Add the DS record to your registrar for .sh TLD
4
Verify: dig +dnssec bun.sh
4
Review certificate configuration
Certificate issues found for bun.sh: wildcard certificate in use. Wildcard certificates have a broader blast radius if compromised. Ensure auto-renewal is configured to prevent expiry. These are operational hygiene items, not immediate security risks.
How to fix this
1
Verify auto-renewal is configured (Let's Encrypt: certbot renew --dry-run)
2
Consider replacing wildcard cert with individual certs for critical subdomains
3
Consolidate certificate issuance to 1–2 trusted CAs
At a glance
Key data points from the scan.
TLS Version
TLSv1.3
TLSv1.3 negotiated with TLS_AES_256_GCM_SHA384 (256-bit). Strong configuration with no deprecated protocols or weak ciphers detected.
DMARC Policy
Not configured
Strengths: SPF record present with soft-fail (~all). Issues: No DMARC record found — email spoofing is not prevented; No DKIM records found for common selectors (domain may use custom selectors — this is not a confirmed gap).
SPF Record
Present
v=spf1 include:spf.efwd.registrar-servers.com include:_spf.google.com ~all
Security Headers
0/5 present
Missing: CSP, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy
HSTS
Enabled
HSTS enabled: max-age=63072000. Missing includeSubDomains. Missing preload directive.
SSL Certificate
Issues
Strengths: Certificate valid, 41 days remaining; Issued by Google Trust Services. Issues: Wildcard certificate in use — broader attack surface if compromised.
DNSSEC
Not enabled
Strengths: 2 nameservers configured (hans.ns.cloudflare.com., naomi.ns.cloudflare.com.); 5 MX records present; Zone transfers properly restricted. Issues: DNSSEC not configured — DNS responses can be spoofed.