Outage in Cloudflare
Duplicated values in X-Forwarded-For header
Resolved MajorIncident Report
Summary AI Generated
Cloudflare experienced a major incident where duplicated values appeared in the X-Forwarded-For header, causing unexpected behavior for origin servers that depend on this header for client IP identification. The issue affected Cloudflare Sites and Services, CDN/Cache, and CDN Cache Purge components for 15.1 hours. After identifying the root cause, Cloudflare implemented a fix that was rolled out over several hours to resolve the header duplication problem.
Cloudflare is investigating duplicated values in the X-Forwarded-For header. Origins depending on this header may exhibit unexpected behavior.
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Latest Updates ( sorted recent to last )
IDENTIFIED
about 1 month ago - at 04/29/2026 06:12AM
We are continuing to work on a fix for this issue. A new expected roll out is ~2.5 hours - ETA ~08:30 UTC.
IDENTIFIED
about 1 month ago - at 04/28/2026 08:39PM
We are continuing to work on a fix for this issue.
IDENTIFIED
about 1 month ago - at 04/28/2026 07:00PM
We are continuing to work on a fix for this issue. A fix is expected to roll out over the next ~11 hours - ETA ~07:00 UTC 29 Apr. 2026.
IDENTIFIED
about 1 month ago - at 04/28/2026 07:00PM
The issue has been identified and a fix is being implemented.
INVESTIGATING
about 1 month ago - at 04/28/2026 06:34PM
We are continuing to investigate this issue.
INVESTIGATING
about 1 month ago - at 04/28/2026 06:31PM
Cloudflare is investigating duplicated values in the X-Forwarded-For header. Origins depending on this header may exhibit unexpected behavior.
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