Hi Joe,
Le 20/11/2025 à 19:07, Joe Abley a écrit :
Hi Emmanuel,
On 20 Nov 2025, at 16:53, Emmanuel Fusté <[email protected]> wrote:
With a colleague we found by accident read world records served by Cloudflare
DNS which are breaking the DNS data model: multiple possible CNAME values for a
same record leading to possible resolver's cache pollution.
As the way to get one value or another is trivial, the way to control the
resolver cached value is trivial too.
We did not find how Cloudflare DNS features and zone content where
used/combined to generate this behavior which is surely unexpected for the zone
operator.
Is there some Cloudflare people here to whom I could provide the zone/records
details to see if it is an expected/assumed behavior or a subtle corner case
bug ?
There are a few of us here. Feel free to ping me off-list!
Joe
Thank you ! Details transmited off-list.
Regards,
Emmanuel.
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