The assertNotPrivateUrl() function blocked standard loopback and link-local
addresses but could be bypassed using IPv4-mapped IPv6 representations:
- http://[::ffff:127.0.0.1]:8080/ → loopback bypass
- http://[::ffff:169.254.169.254]:8080/ → metadata endpoint bypass
- http://[::]:8080/ → all-interfaces bypass
Node.js normalises these to [::ffff:7f00:1], [::ffff:a9fe:a9fe], and [::]
respectively, none of which matched the existing regex patterns.
Add two patterns to close the gap:
- /^\[::ffff:/i catches all IPv4-mapped IPv6 addresses
- /^\[::\]$/ catches the IPv6 all-zeros address
Legitimate RFC1918 LAN URLs (192.168.x, 10.x, 172.16-31.x) remain allowed.
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