SECURITY UPDATE: Use-after-free on reallocated remote forwarding data
debian/patches/CVE-2026-73282.patch: pass an index-based
rfwd_confirm_ctx to client_register_global_confirm() instead of a
pointer into the options.remote_forwards array, so that a remote
forwarding added over the local multiplexing socket cannot leave
ssh_confirm_remote_forward() holding a pointer invalidated by the
array reallocation, in ssh.c