fix: add lambda:InvokeFunction permission for CloudFront OAC#83
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konokenj merged 2 commits intoaws-samples:mainfrom Mar 19, 2026
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CDK's NatInstanceProviderV2 uses the `route` command in its default user data, which requires the net-tools package. However, Amazon Linux 2023 (the default AMI for NatInstanceProviderV2) doesn't have net-tools pre-installed, causing NAT instances to fail silently. This change provides custom user data that uses `ip route` instead of `route` to determine the default network interface, ensuring NAT functionality works correctly on AL2023. Reference: https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-ec2/lib/nat.ts
Starting October 2025, new Lambda function URLs require both lambda:InvokeFunctionUrl and lambda:InvokeFunction permissions when using CloudFront Origin Access Control (OAC). CDK's FunctionUrlOrigin.withOriginAccessControl only adds lambda:InvokeFunctionUrl, so new deployments would fail with 403 errors. Reference: https://docs.aws.amazon.com/lambda/latest/dg/urls-auth.html
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Root cause on aws-cdk aws/aws-cdk#35872 |
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In order to begin v3 development, we will resolve the v2 issue by merging this correction without waiting for the CDK itself to be compatible. |
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🤖 I have created a release *beep* *boop* --- ## [2.1.0](v2.0.0...v2.1.0) (2026-03-22) ### Features * add /update-snapshot comment trigger to update_snapshot workflow ([764a4fa](764a4fa)) * add CloudWatch LogGroup with retention policy to Lambda functions ([#117](#117)) ([53877bb](53877bb)), closes [#103](#103) * **database:** enable Data API and connection logging ([#123](#123)) ([e32dc7a](e32dc7a)) * increase webapp Lambda memory from 512MB to 1024MB ([#116](#116)) ([03c5a00](03c5a00)), closes [#101](#101) ### Bug Fixes * add lambda:InvokeFunction permission for CloudFront OAC ([#83](#83)) ([3cc66bf](3cc66bf)) * **auth:** improve auth error handling and fix Link CORS issue ([#120](#120)) ([84be605](84be605)) * disable Cognito self sign-up by default ([#115](#115)) ([9396e6f](9396e6f)), closes [#106](#106) * prevent CloudFront cache poisoning for Next.js RSC responses ([#119](#119)) ([70cddda](70cddda)) * **prisma:** add retry for Aurora Serverless v2 connection errors ([#121](#121)) ([7c05dfb](7c05dfb)) * support Amazon Linux 2023 for NAT instance ([#81](#81)) ([0c41aa8](0c41aa8)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Summary
Starting October 2025, new Lambda function URLs require both
lambda:InvokeFunctionUrlandlambda:InvokeFunctionpermissions when using CloudFront Origin Access Control (OAC).Problem
CDK's
FunctionUrlOrigin.withOriginAccessControlonly addslambda:InvokeFunctionUrlpermission. New deployments after October 2025 would fail with 403 errors because thelambda:InvokeFunctionpermission is missing.Solution
Explicitly add
lambda:InvokeFunctionpermission usingCfnPermission.Reference
Dependencies
Please merge #81 first. This PR is based on that branch and will have no conflicts once #81 is merged.