diff --git a/binding/binding.go b/binding/binding.go
index eced0ae2..c6142d5c 100644
--- a/binding/binding.go
+++ b/binding/binding.go
@@ -125,3 +125,9 @@ func validate(obj any) error {
 	}
 	return Validator.ValidateStruct(obj)
 }
+
+// MaxBodySize is the maximum request body size in bytes that BSON and
+// Protobuf binders will read. If the request body exceeds this limit,
+// the binding returns an error. Defaults to 32 MB.
+var MaxBodySize int64 = 32 << 20
+
diff --git a/binding/bson.go b/binding/bson.go
index 464890f0..37736d06 100644
--- a/binding/bson.go
+++ b/binding/bson.go
@@ -5,6 +5,7 @@
 package binding
 
 import (
+	"errors"
 	"io"
 	"net/http"
 
@@ -18,11 +19,14 @@ func (bsonBinding) Name() string {
 }
 
 func (b bsonBinding) Bind(req *http.Request, obj any) error {
-	buf, err := io.ReadAll(req.Body)
-	if err == nil {
-		err = b.BindBody(buf, obj)
+	body, err := io.ReadAll(io.LimitReader(req.Body, MaxBodySize+1))
+	if err != nil {
+		return err
 	}
-	return err
+	if int64(len(body)) > MaxBodySize {
+		return errors.New("request body too large")
+	}
+	return b.BindBody(body, obj)
 }
 
 func (bsonBinding) BindBody(body []byte, obj any) error {
diff --git a/binding/protobuf.go b/binding/protobuf.go
index 259ae8e7..2d35ae1f 100644
--- a/binding/protobuf.go
+++ b/binding/protobuf.go
@@ -19,11 +19,14 @@ func (protobufBinding) Name() string {
 }
 
 func (b protobufBinding) Bind(req *http.Request, obj any) error {
-	buf, err := io.ReadAll(req.Body)
+	body, err := io.ReadAll(io.LimitReader(req.Body, MaxBodySize+1))
 	if err != nil {
 		return err
 	}
-	return b.BindBody(buf, obj)
+	if int64(len(body)) > MaxBodySize {
+		return errors.New("request body too large")
+	}
+	return b.BindBody(body, obj)
 }
 
 func (protobufBinding) BindBody(body []byte, obj any) error {