> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/appsec-rules/iac-security/compute/appsec-aws-363.md).

# Runtime of Lambda is deprecated misconfiguration detected in code

## Rule Details

|                        |                                           |
| ---------------------- | ----------------------------------------- |
| Cortex AppSec Rule ID  | APPSEC\_AWS\_363                          |
| Category - Subcategory | Compute - Unsanctioned Resource Or Type   |
| Provider               | AWS                                       |
| Severity               | MEDIUM                                    |
| Framework              | CloudFormation, Terraform, Terraform Plan |

## Impact

This rule is checking to make sure that the runtime used for Lambda is not deprecated. Lambda is an AWS service which lets you run your code without provisioning or managing servers. A runtime in this context refers to the programming language environment in which your code will be executed.

Using deprecated runtimes can be problematic for several reasons. Deprecated runtimes may no longer receive security updates, leaving your code vulnerable to newly discovered security threats. Additionally, deprecated runtimes might not support the latest language features, and can result in compatibility issues with other software in your stack. Using outdated runtimes can also lead to increased maintenance costs and technical debt as the runtime becomes further out of date.

## How to Fix

To fix this issue, ensure that the `Runtime` property in the `AWS::Lambda::Function` or `AWS::Serverless::Function` resource is set to a supported runtime that is not deprecated.

## Example: \[source,go]

## { "Resources": { "MyLambdaFunction": { "Type": "AWS::Lambda::Function", "Properties": { ... "Runtime": "nodejs18.x", # Ensure to use a supported runtime ... } } } }

## Resources: MyServerlessFunction: Type: AWS::Serverless::Function Properties: ... Runtime: nodejs18.x # Ensure to use a supported runtime


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