X-Forwarded-For header wrongly populated

Resolved

This incident has been resolved.

Update

A fix has been implemented and we are monitoring the results.

Update

The issue has been identified and a fix is being implemented.

Investigating

Cloudflare is investigating a limited number of customer reports of the X-Forwarded-For header wrongly populating IPv6 values when using the Cloudflare Pseudo IPv4 feature.