diff --git a/pkg/workflow/template_injection_validation.go b/pkg/workflow/template_injection_validation.go
index c8eb0b3c61c..9d97904ec29 100644
--- a/pkg/workflow/template_injection_validation.go
+++ b/pkg/workflow/template_injection_validation.go
@@ -232,6 +232,10 @@ func validateNoGitHubExpressionsInRunScriptsFromParsed(workflow map[string]any)
 	var violations []TemplateInjectionViolation
 
 	for _, runContent := range runBlocks {
+		if !mayContainInlineExpression(runContent) {
+			continue
+		}
+
 		// Align with template-injection validation by excluding non-executable regions:
 		// heredoc bodies and bash # comments.
 		contentWithoutHeredocs := stripShellLineComments(removeHeredocContent(runContent))
diff --git a/pkg/workflow/template_injection_validation_benchmark_test.go b/pkg/workflow/template_injection_validation_benchmark_test.go
index 3ecba32637f..997eedc7046 100644
--- a/pkg/workflow/template_injection_validation_benchmark_test.go
+++ b/pkg/workflow/template_injection_validation_benchmark_test.go
@@ -1,6 +1,10 @@
 package workflow
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/goccy/go-yaml"
+)
 
 func BenchmarkValidateTemplateInjectionFastPath(b *testing.B) {
 	compiler := NewCompiler()
@@ -27,3 +31,31 @@ jobs:
 		}
 	}
 }
+
+func BenchmarkValidateNoGitHubExpressionsInRunScriptsFromParsed_NoExpressions(b *testing.B) {
+	yamlContent := `
+name: no-inline-expression
+on: workflow_dispatch
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: No expression run
+        run: |
+          echo "hello"
+          echo "world"
+`
+
+	var parsed map[string]any
+	if err := yaml.Unmarshal([]byte(yamlContent), &parsed); err != nil {
+		b.Fatal(err)
+	}
+
+	b.ResetTimer()
+	b.ReportAllocs()
+	for b.Loop() {
+		if err := validateNoGitHubExpressionsInRunScriptsFromParsed(parsed); err != nil {
+			b.Fatalf("validateNoGitHubExpressionsInRunScriptsFromParsed() error = %v", err)
+		}
+	}
+}