diff --git a/.changes/42b15168-de5f-46aa-867a-02a28b4a7b31.json b/.changes/42b15168-de5f-46aa-867a-02a28b4a7b31.json
new file mode 100644
index 00000000000..2694d0c414f
--- /dev/null
+++ b/.changes/42b15168-de5f-46aa-867a-02a28b4a7b31.json
@@ -0,0 +1,8 @@
+{
+    "id": "42b15168-de5f-46aa-867a-02a28b4a7b31",
+    "type": "bugfix",
+    "description": "Properly handle members with HTTP header bindings to x-amz-content-sha256",
+    "issues": [
+        "https://github.com/awslabs/aws-sdk-kotlin/issues/1217"
+    ]
+}
\ No newline at end of file
diff --git a/codegen/aws-sdk-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/customization/UpdateExecutionContextWithXAmzContentSha256HeaderBinding.kt b/codegen/aws-sdk-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/customization/UpdateExecutionContextWithXAmzContentSha256HeaderBinding.kt
new file mode 100644
index 00000000000..61ab4fc2acb
--- /dev/null
+++ b/codegen/aws-sdk-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/customization/UpdateExecutionContextWithXAmzContentSha256HeaderBinding.kt
@@ -0,0 +1,47 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package aws.sdk.kotlin.codegen.customization
+
+import software.amazon.smithy.kotlin.codegen.core.KotlinWriter
+import software.amazon.smithy.kotlin.codegen.core.RuntimeTypes
+import software.amazon.smithy.kotlin.codegen.core.defaultName
+import software.amazon.smithy.kotlin.codegen.core.withBlock
+import software.amazon.smithy.kotlin.codegen.integration.KotlinIntegration
+import software.amazon.smithy.kotlin.codegen.model.getTrait
+import software.amazon.smithy.kotlin.codegen.rendering.protocol.ProtocolGenerator
+import software.amazon.smithy.kotlin.codegen.rendering.protocol.ProtocolMiddleware
+import software.amazon.smithy.model.shapes.MemberShape
+import software.amazon.smithy.model.shapes.OperationShape
+import software.amazon.smithy.model.traits.HttpHeaderTrait
+
+/**
+ * Registers a middleware which overrides the execution context HashSpecification for members with an HTTP header binding
+ * to `x-amz-content-sha256`.
+ * https://github.com/awslabs/aws-sdk-kotlin/issues/1217
+ */
+class UpdateExecutionContextWithXAmzContentSha256HeaderBinding : KotlinIntegration {
+    override fun customizeMiddleware(
+        ctx: ProtocolGenerator.GenerationContext,
+        resolved: List<ProtocolMiddleware>,
+    ): List<ProtocolMiddleware> = resolved + UpdateExecutionContextWithSha256HeaderBindingMiddleware()
+}
+
+private class UpdateExecutionContextWithSha256HeaderBindingMiddleware : ProtocolMiddleware {
+    override val name: String = "UpdateExecutionContextWithXAmzContentSha256HeaderBinding"
+
+    override fun isEnabledFor(ctx: ProtocolGenerator.GenerationContext, op: OperationShape): Boolean = getXAmzContentSha256HeaderMember(ctx, op) != null
+
+    override fun render(ctx: ProtocolGenerator.GenerationContext, op: OperationShape, writer: KotlinWriter) {
+        val member = getXAmzContentSha256HeaderMember(ctx, op)!!
+        writer.withBlock("input.${member.defaultName()}?.let {", "}") {
+            writer.write("op.context[#1T.#2T] = #2T.Precalculated(it)", RuntimeTypes.Auth.Signing.AwsSigningCommon.AwsSigningAttributes, RuntimeTypes.Auth.Signing.AwsSigningCommon.HashSpecification)
+        }
+    }
+
+    private fun getXAmzContentSha256HeaderMember(ctx: ProtocolGenerator.GenerationContext, op: OperationShape): MemberShape? {
+        val input = ctx.model.expectShape(op.inputShape)
+        return input.members().singleOrNull { it.getTrait<HttpHeaderTrait>()?.value?.equals("x-amz-content-sha256") ?: false }
+    }
+}
diff --git a/codegen/aws-sdk-codegen/src/main/resources/META-INF/services/software.amazon.smithy.kotlin.codegen.integration.KotlinIntegration b/codegen/aws-sdk-codegen/src/main/resources/META-INF/services/software.amazon.smithy.kotlin.codegen.integration.KotlinIntegration
index 1eeb8f5a1d3..74035829c00 100644
--- a/codegen/aws-sdk-codegen/src/main/resources/META-INF/services/software.amazon.smithy.kotlin.codegen.integration.KotlinIntegration
+++ b/codegen/aws-sdk-codegen/src/main/resources/META-INF/services/software.amazon.smithy.kotlin.codegen.integration.KotlinIntegration
@@ -39,3 +39,4 @@ aws.sdk.kotlin.codegen.customization.RemoveDefaults
 aws.sdk.kotlin.codegen.customization.s3.UnsupportedSigningAlgorithmIntegration
 aws.sdk.kotlin.codegen.customization.SigV4AsymmetricTraitCustomization
 aws.sdk.kotlin.codegen.customization.cloudfrontkeyvaluestore.BackfillSigV4ACustomization
+aws.sdk.kotlin.codegen.customization.UpdateExecutionContextWithXAmzContentSha256HeaderBinding
\ No newline at end of file