Image Version Not Explicit @ /Dockerfile

[YSLCx]

Checkmarx (IaC-Security): Image Version Not Explicit
Checkmarx Project: YSLCx/Github_demo
Repository URL: https://github.com/YSLCx/Github_demo
Branch: main
Scan ID: f799fc13-25e4-479c-a802-e1aeacbb3e2d

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Always tag the version of an image explicitly

Locations:

Result #1:
Severity: MEDIUM
State: TO_VERIFY
Status: RECURRENT
    File: /Dockerfile[1,0]
    Expected value: FROM tomcat:'version'
    Actual value: FROM tomcat'
    Review result in Checkmarx One: Image Version Not Explicit