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Garry Tan 84593bb97a fix(security): block hex-encoded IPv4-mapped IPv6 metadata bypass
URL constructor normalizes ::ffff:169.254.169.254 to ::ffff:a9fe:a9fe
(hex form), which was not in the blocklist. Similarly, ::169.254.169.254
normalizes to ::a9fe:a9fe.

Add both hex-encoded forms to BLOCKED_METADATA_HOSTS so they're caught
by the direct hostname check in validateNavigationUrl.

Closes #739

Co-Authored-By: Osman Mehmood <mehmoodosman@users.noreply.github.com>
2026-04-13 09:42:16 -07:00
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