## Image hierarchy

The image you inspect may have one or more base images represented under
**Image hierarchy**. This means the author of the image used other images as
starting points when building the image. Often these base images are either
operating system images such as Debian, Ubuntu, and Alpine, or programming
language images such as PHP, Python, and Java.

Selecting each image in the chain lets you see which layers originate from each
base image. Selecting the **ALL** row selects all layers and base images.

One or more of the base images may have updates available, which may include
updated security patches that remove vulnerabilities from your image. Any base
images with available updates are noted to the right of **Image hierarchy**.

## Layers

A Docker image consists of layers. Image layers are listed from top to bottom,
with the earliest layer at the top and the most recent layer at the bottom.
Often, the layers at the top of the list originate from a base image, and the
layers towards the bottom added by the image author, often using
commands in a Dockerfile. Selecting a base image under **Image hierarchy** 
highlights with layers originate from a base image.

Selecting individual or multiple layers filters the packages and vulnerabilities
on the right-hand side to show what the selected layers added.

## Vulnerabilities

The **Vulnerabilities** tab displays a list of vulnerabilities and exploits detected in the image. The list is grouped by package, and sorted in order of severity.

You can find further information on the vulnerability or exploit, including if a fix is available, by expanding the list item.

## Remediation recommendations

When you inspect an image in Docker Desktop or Docker Hub,
Docker Scout can provide recommendations for improving the security of that image.

### Recommendations in Docker Desktop

To view security recommendations for an image in Docker Desktop:

1. Go to the **Images** view in Docker Desktop.
2. Select the image tag that you want to view recommendations for.
3. Near the top, select the **Recommended fixes** drop-down button.

The drop-down menu lets you choose whether you want to see recommendations for
the current image or any base images used to build it:

- [**Recommendations for this image**](#recommendations-for-current-image)
  provides recommendations for the current image that you're inspecting.
- [**Recommendations for base image**](#recommendations-for-base-image) provides
  recommendations for base images used to build the image.

If the image you're viewing has no associated base images, the drop-down menu only 
shows the option to view recommendations for the current image.

### Recommendations in Docker Hub

To view security recommendations for an image in Docker Hub:

1. Go to the repository page for an image where you have activated Docker Scout
   image analysis.
2. Open the **Tags** tab.
3. Select the tag that you want to view recommendations for.
4. Select the **View recommended base image fixes** button.

   This opens a window which gives you recommendations for you can improve the
   security of your image by using better base images. See
   [Recommendations for base image](#recommendations-for-base-image) for more
   details.

### Recommendations for current image

The recommendations for the current image view helps you determine whether the image
version that you're using is out of date. If the tag you're using is referencing an
old digest, the view shows a recommendation to update the tag by pulling the
latest version.

Select the **Pull new image** button to get the updated version. Check the
checkbox to remove the old version after pulling the latest.

### Recommendations for base image

The base image recommendations view contains two tabs for toggling between