diff --git a/cli/azd/pkg/project/service_manager.go b/cli/azd/pkg/project/service_manager.go
index 554d93b5a45..82be6a05aae 100644
--- a/cli/azd/pkg/project/service_manager.go
+++ b/cli/azd/pkg/project/service_manager.go
@@ -12,6 +12,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"regexp"
 	"strings"
 
 	"github.com/azure/azure-dev/cli/azd/pkg/alpha"
@@ -278,6 +279,11 @@ func (sm *serviceManager) Package(
 		options = &PackageOptions{}
 	}
 
+	// Check if the application name is valid.
+	if err := validateAppName(serviceConfig.Project.Name); err != nil {
+		return nil, err
+	}
+
 	cachedResult, ok := sm.getOperationResult(serviceConfig, string(ServiceEventPackage))
 	if ok && cachedResult != nil {
 		return cachedResult.(*ServicePackageResult), nil
@@ -685,3 +691,21 @@ func moveFile(sourcePath string, destinationPath string) error {
 
 	return nil
 }
+
+func validateAppName(name string) error {
+	if len(name) < 2 {
+		return fmt.Errorf("invalid application name '%s': must be at least 2 characters", name)
+	}
+	matched, err := regexp.MatchString(`^[a-zA-Z0-9_-]+$`, name)
+	if err != nil {
+		return err
+	}
+	if !matched {
+		return fmt.Errorf(
+			"invalid application name '%s': only letters, numbers, underscores (_), and hyphens (-) are allowed",
+			name,
+		)
+
+	}
+	return nil
+}
diff --git a/schemas/alpha/azure.yaml.json b/schemas/alpha/azure.yaml.json
index 1f64b3969e5..9af35489fd0 100644
--- a/schemas/alpha/azure.yaml.json
+++ b/schemas/alpha/azure.yaml.json
@@ -10,7 +10,9 @@
         "name": {
             "type": "string",
             "minLength": 2,
-            "title": "Name of the application"
+            "title": "Name of the application",
+            "pattern": "^[a-zA-Z0-9_-]+$",
+            "description": "The application name. Only letters, numbers, underscores, and hyphens are allowed. Characters like /, \\, spaces, or other special symbols are not permitted."
         },
         "resourceGroup": {
             "type": "string",
diff --git a/schemas/v1.0/azure.yaml.json b/schemas/v1.0/azure.yaml.json
index 351740f2ca5..114b6591575 100644
--- a/schemas/v1.0/azure.yaml.json
+++ b/schemas/v1.0/azure.yaml.json
@@ -10,7 +10,9 @@
         "name": {
             "type": "string",
             "minLength": 2,
-            "title": "Name of the application"
+            "title": "Name of the application",
+            "pattern": "^[a-zA-Z0-9_-]+$",
+            "description": "The application name. Only letters, numbers, underscores, and hyphens are allowed. Characters like /, \\, spaces, or other special symbols are not permitted."
         },
         "resourceGroup": {
             "type": "string",