diff -Nurp libtasn1-4.13-orig/lib/int.h libtasn1-4.13/lib/int.h
--- libtasn1-4.13-orig/lib/int.h	2016-09-11 11:53:52.000000000 +0200
+++ libtasn1-4.13/lib/int.h	2022-10-25 09:40:21.061918424 +0200
@@ -98,7 +98,7 @@ typedef struct tag_and_class_st
 #define ETYPE_TAG(etype) (_asn1_tags[etype].tag)
 #define ETYPE_CLASS(etype) (_asn1_tags[etype].class)
 #define ETYPE_OK(etype) (((etype) != ASN1_ETYPE_INVALID && \
-                          (etype) <= _asn1_tags_size && \
+                          (etype) < _asn1_tags_size && \
                           _asn1_tags[(etype)].desc != NULL)?1:0)
 
 #define ETYPE_IS_STRING(etype) ((etype == ASN1_ETYPE_GENERALSTRING || \