Add FAQ: random hostnames in HTTP logs for partial zones #27398
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Explains why customers with partial (CNAME) zones may see unexpected hostnames in HTTP request logs due to Host header injection attacks. Includes identification patterns and WAF custom rule solution.
rianvdm
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angelampcosta and
soheiokamoto
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Explains why customers with partial (CNAME) zones may see unexpected hostnames in HTTP request logs due to Host header injection attacks. Includes identification patterns and WAF custom rule solution.
…flare/cloudflare-docs into rian/logs-random-hostnames
angelampcosta
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Jan 5, 2026
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Summary
Adds a new FAQ page explaining why customers with partial (CNAME) zones see unexpected hostnames in their HTTP request logs.
What this PR adds
New page:
/logs/faq/random-hostnames-partial-zones/Covers:
Updated: /logs/faq/index.mdx
Why
This is a common support question for customers using partial zone setups. The behavior is expected (Cloudflare logs the
Hostheader as-is) but can be confusing without context.