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Google Cloud Security Blog · October 15, 2026

VPC Service Controls: verify inherited protection before moving projects

news Agent SecurityAI Engineering
Why it matters

Google Cloud adds folder-based VPC Service Controls membership, letting projects inherit a perimeter. Explicit settings and hierarchy moves can change the effective protection. Documentation also identifies a critical exception: explicitly adding a VPC network project to a dry-run perimeter removes its inherited folder-based enforcement. Test actual access decisions; a dry-run label alone does not establish safety.

My takeaway: Check effective enforced and dry-run membership with LookupConfiguredServicePerimeter. Test permitted and denied access in an isolated canary project before hierarchy changes. Keep explicit project membership for at least 48 hours during folder migration, and check the documented network-project exception before configuring dry runs.
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