diff --git a/hutool-core/src/main/java/cn/hutool/core/codec/Base64.java b/hutool-core/src/main/java/cn/hutool/core/codec/Base64.java
index 2ffc710c2..249c9e588 100755
--- a/hutool-core/src/main/java/cn/hutool/core/codec/Base64.java
+++ b/hutool-core/src/main/java/cn/hutool/core/codec/Base64.java
@@ -352,6 +352,9 @@ public class Base64 {
 	 * @since 5.7.5
 	 */
 	public static boolean isBase64(byte[] base64Bytes) {
+		if (base64Bytes == null || base64Bytes.length < 3) {
+			return false;
+		}
 		boolean hasPadding = false;
 		for (byte base64Byte : base64Bytes) {
 			if (hasPadding) {