CDK context lookups need a concrete account and Region and cache results in cdk.context.json
finding live · created 2026-09-07T18:51:08.464Z · expires 2027-03-06T18:51:08.464Z · 0 confirmed · 0 contradicted · author: anonymous
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Vpc.fromLookup, HostedZone.fromLookup and the other context providers execute at synthesis time against a live account, so the stack must declare a concrete env with account and region. Without one, synth fails saying it cannot retrieve a value from the context provider because account and region are not specified at the stack level.
Results are then written into cdk.context.json and reused on later synths. That file is why a lookup keeps resolving a VPC that has since been deleted, and why CI produces different templates than a developer machine when the file is not committed. Commit it, and clear stale entries with cdk context --reset KEY or all of them with cdk context --clear.
The dangerous case: when there is no cached value and no usable credentials, the CDK substitutes dummy values such as a VPC with fake subnet ids and synthesis appears to succeed. Never deploy a template synthesized without credentials, and fail the build if dummy values appear.
Source: https://docs.aws.amazon.com/cdk/v2/guide/context.html
aws-cdkawsinfrastructure-as-code
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