diff --git a/py/objlist.c b/py/objlist.c
index 41c920511d2d4..4059a223e46ee 100644
--- a/py/objlist.c
+++ b/py/objlist.c
@@ -132,6 +132,9 @@ static mp_obj_t list_binary_op(mp_binary_op_t op, mp_obj_t lhs, mp_obj_t rhs) {
             if (n < 0) {
                 n = 0;
             }
+            if (o->len != 0 && (size_t)n > SIZE_MAX / o->len) {
+                mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("repeated list is too long"));
+            }
             mp_obj_list_t *s = list_new(o->len * n);
             mp_seq_multiply(o->items, sizeof(*o->items), o->len, n, s->items);
             return MP_OBJ_FROM_PTR(s);
diff --git a/py/objstr.c b/py/objstr.c
index 06afb91fc7f73..18740b96eb3b7 100644
--- a/py/objstr.c
+++ b/py/objstr.c
@@ -393,6 +393,9 @@ mp_obj_t mp_obj_str_binary_op(mp_binary_op_t op, mp_obj_t lhs_in, mp_obj_t rhs_i
         if (n <= 0) {
             return make_empty_str_of_type(lhs_type);
         }
+        if (lhs_len != 0 && (size_t)n > SIZE_MAX / lhs_len) {
+            mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("repeated string is too long"));
+        }
         vstr_t vstr;
         vstr_init_len(&vstr, lhs_len * n);
         mp_seq_multiply(lhs_data, sizeof(*lhs_data), lhs_len, n, vstr.buf);
diff --git a/py/objtuple.c b/py/objtuple.c
index c0ba1fd0d11e4..9a1798636b3f0 100644
--- a/py/objtuple.c
+++ b/py/objtuple.c
@@ -169,6 +169,9 @@ mp_obj_t mp_obj_tuple_binary_op(mp_binary_op_t op, mp_obj_t lhs, mp_obj_t rhs) {
             if (n <= 0) {
                 return mp_const_empty_tuple;
             }
+            if (o->len != 0 && (size_t)n > SIZE_MAX / o->len) {
+                mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("repeated tuple is too long"));
+            }
             mp_obj_tuple_t *s = MP_OBJ_TO_PTR(mp_obj_new_tuple(o->len * n, NULL));
             mp_seq_multiply(o->items, sizeof(*o->items), o->len, n, s->items);
             return MP_OBJ_FROM_PTR(s);
diff --git a/tests/basics/sequence_repeat_overflow.py b/tests/basics/sequence_repeat_overflow.py
new file mode 100644
index 0000000000000..21f12e773f9c6
--- /dev/null
+++ b/tests/basics/sequence_repeat_overflow.py
@@ -0,0 +1,14 @@
+# Repeating a sequence by a huge count must raise, not overflow the size
+# calculation and corrupt memory.
+import sys
+
+# count chosen so that (length-8 sequence) * count wraps a size_t to a small value
+word = 64 if sys.maxsize > 2**32 else 32
+count = (1 << (word - 3)) + 1
+
+for x in (b"01234567", "01234567", [0, 1, 2, 3, 4, 5, 6, 7], (0, 1, 2, 3, 4, 5, 6, 7)):
+    try:
+        x * count
+        print("no exception")
+    except (OverflowError, MemoryError):
+        print("caught")