If you use the default qmcgaw/gluetun image, you are technically using the Docker image with the :latest tag.
If it happens to be broken, this page is for you.
ℹ️ Live list of recent image tags
Multiple releases are made through time when the image is considered stable.
Each time a Github release is made, an associated Docker image tag is made, for example a v3.1.0 release produces the image qmcgaw/gluetun:v3.1.0.
You can thus use one of these image tags if :latest doesn't work for you. Also, don't forget to create an issue for it 😉
Finally you can also use image tag :v3 to get the latest stable release (for example v3.28.2),
although I would appreciate if you can use the latest image instead to detect issues faster.