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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
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