--- a/src/crwimage.cpp	2019-07-17 16:22:44.284000000 +0800
+++ b/src/crwimage_1.cpp	2019-07-17 16:23:57.032000000 +0800
@@ -460,7 +460,7 @@ namespace Exiv2 {
 #endif
         o += 2;
         for (uint16_t i = 0; i < count; ++i) {
-            if (o + 10 > size) throw Error(33);
+            if (size < 10 || o > size-10) throw Error(33);
             uint16_t tag = getUShort(pData + o, byteOrder);
             CiffComponent::AutoPtr m;
             switch (CiffComponent::typeId(tag)) {
