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Always tag the version of an image explicitly.
PropertyValue
SeverityWarning
CategoryBest Practice
DefaultEnabled

Description

You can never rely that the latest tag is a specific version. Always tag the version of an image explicitly to ensure reproducible builds.

Examples

Problematic code

FROM debian

Correct code

FROM debian:jessie

Exception

When the image name refers to a previously defined alias, tagging is not required:
FROM debian:jessie as build
RUN build_script

FROM build as tests
RUN test_script

FROM debian:jessie
COPY --from=build foo .

Reference