dssrf: every IPv6 category bypasses is_url_safe

mkdir dssrf-poc && cd dssrf-poc
npm init -y >/dev/null
npm install dssrf@^1.0.2
cat > audit.js <<'EOF'
const dssrf = require('dssrf');
const cases = [
  ['http://[::1]/',                         'IPv6 loopback'],
  ['http://[fc00::1]/',                     'IPv6 ULA'],
  ['http://[fe80::1]/',                     'IPv6 link-local'],
  ['http://[::ffff:127.0.0.1]/',            'IPv4-mapped loopback'],
  ['http://[::ffff:169.254.169.254]/',      'IPv4-mapped IMDS'],
  ['http://[64:ff9b::7f00:1]/',             'NAT64 well-known + 127.0.0.1'],
  ['http://[64:ff9b:1::1]/',                'NAT64 local-use (RFC 8215)'],
  ['http://[5f00::1]/',                     'SRv6 SID (RFC 9602)'],
  ['http://[fec0::1]/',                     'IPv6 site-local deprecated'],
  ['http://127.0.0.1/',                     'IPv4 loopback (control)'],
  ['http://10.0.0.1/',                      'IPv4 RFC1918 (control)'],
  ['http://8.8.8.8/',                       'PUBLIC IPv4 (control)'],
];
(async () => {
  for (const [url, label] of cases) {
    const safe = await dssrf.is_url_safe(url);
    console.log(`${safe ? '✓ALLOW' : '·block'}  ${url.padEnd(40)}  ${label}`);
  }
})();
EOF
node audit.js