CVE-2026-8458: tie the requested SASL/SPNEGO service name to the connection
and compare it when matching an existing connection for reuse, so a
Negotiate authenticated connection is not reused for a transfer that asked
for a different service
CVE-2026-8926: discard a .netrc entry that matches the host but whose login
does not match the user given in the URL, so the password that belongs to
another user of that host is no longer returned as a successful lookup