Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From USN-4589-2:
USN-4589-1 fixed a vulnerability in containerd. This update provides the corresponding update for docker.io.
Original advisory details:
It was discovered that containerd could be made to expose sensitive information when processing URLs in container image manifests. A remote attacker could use this to trick the user and obtain the user's registry credentials.
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