[whatwg/fetch] Prevent fetching from IPv4-mapped IPv6 addresses (Issue #1492) from Titouan Rigoudy on 2022-09-22 (public-webapps-github@w3.org from September 2022)

From: Titouan Rigoudy <notifications@github.com>
Date: Thu, 22 Sep 2022 05:19:54 -0700
To: whatwg/fetch <fetch@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <whatwg/fetch/issues/1492@github.com>

Quoting my distinguished self from https://github.com/WICG/private-network-access/issues/36:

> Dual stack applications such as modern browsers should never have to deal with IPv4-mapped IPv6 addresses (https://tools.ietf.org/html/rfc4291#section-2.5.5), as they can simply use IPv4 addresses instead. This is not the case today however, at least in Chromium, in which for example `[::ffff:7f00:1]` resolves to localhost.

It seems to me that Fetch should forbid accesses to such IP addresses. What do y'all think?

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Received on Thursday, 22 September 2022 12:20:06 UTC