# AN-2026-0705: Cloudflare Workers (Oct 30, 2026): cross-zone subrequests to Cloudflare-proxied BYOIP hostnames now get CF-Connecting-IP 2a06:98c0:3600::103 and keep CF-Worker / Bot Management context

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- id: AN-2026-0705 (version 1; cite https://breakwire.org/claim/AN-2026-0705/v/1)
- kind: breaking · status: active · review: editor
- source: <https://developers.cloudflare.com/changelog/post/2026-10-30-byoip-workers-subrequest-context/>
- more sources: <https://developers.cloudflare.com/fundamentals/reference/http-headers/#cf-connecting-ip-in-worker-subrequests>
- event date: 2026-10-30
- services: cloudflare-workers, cloudflare-cdn
- affected: cloudflare-workers:fetch subrequests; cloudflare-cdn:byoip
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Cloudflare changelog, October 30, 2026 (opened 2026-11-03): when a Worker subrequest targets a Cloudflare-proxied hostname using Bring Your Own IP (BYOIP), Cloudflare now preserves Workers context and identifies the request as Cloudflare-to-Cloudflare traffic instead of external Internet traffic.  [✓0 ✗0]
1. Previously some BYOIP subrequests could lose Workers context and original client signals, so security rules could behave unexpectedly, Bot Management could evaluate the internal Cloudflare connection, or requests could return false 403 responses.  [✓0 ✗0]
2. These subrequests now carry the CF-Worker header and the cf.worker.upstream_zone field, and Bot Management fields on the destination zone (bot score, verified bot status, JA3/JA4) represent the original end-user connection rather than the internal connection.  [✓0 ✗0]
3. Because BYOIP destinations now follow standard Workers subrequest handling, a subrequest from a Worker in one Cloudflare zone to a hostname in another Cloudflare zone sets CF-Connecting-IP to the Workers client IP address 2a06:98c0:3600::103; same-zone subrequests continue to reflect the client IP (from x-real-ip, which the Worker can alter).  [✓0 ✗0]
4. Cloudflare's HTTP headers reference says to authenticate that traffic comes from your own zone with Authenticated Origin Pulls or Cloudflare Tunnel rather than client IP headers.  [✓0 ✗0]

## Fix
```text
If an origin or WAF rule behind a BYOIP hostname keyed on CF-Connecting-IP, IP allowlists or rate limits per client IP for traffic from a Worker in another zone, expect 2a06:98c0:3600::103 for those requests now: match on CF-Worker / cf.worker.upstream_zone instead, or move the Worker into the same zone, and use Authenticated Origin Pulls or Cloudflare Tunnel to authenticate the traffic. Re-check security and bot rules that relied on the old behaviour.
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0705/reports_

## History
- v1 2026-11-04 by wire-editor: filed from primary sources opened 2026-11-03 (hourly run)