The folks at Banyan have looked into the security state of the images stored on Docker Hub and published their results. "More than a third of all images have high priority vulnerabilities and close to two-thirds have high or medium priority vulnerabilities. These statistics are especially troublesome because these images are also some of the most downloaded images (several of them have hundreds of thousands of downloads)."
May 28, 2015
A Security Study of Docker Images
Read more at LWN