diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 4ac07123b86..10714c82d56 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -681,6 +681,9 @@ def __format__(self, format_spec):
         self.assertRaises(IndexError, "{:}".format)
         self.assertRaises(IndexError, "{:s}".format)
         self.assertRaises(IndexError, "{}".format)
+        big = "23098475029384702983476098230754973209482573"
+        self.assertRaises(ValueError, ("{" + big + "}").format)
+        self.assertRaises(ValueError, ("{[" + big + "]}").format, [0])
 
         # issue 6089
         self.assertRaises(ValueError, "{0[0]x}".format, [None])
diff --git a/Misc/NEWS b/Misc/NEWS
index d83af836e3a..fc3dd779971 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -15,6 +15,9 @@ Core and Builtins
 - Issue #8837: Remove "O?" format of PyArg_Parse*() functions. The format is no
   used anymore and it was never documented.
 
+- In the str.format(), raise a ValueError when either indexes to arguments are
+  too large.
+
 - Issue #2844: Make int('42', n) consistently raise ValueError for
   invalid integers n (including n = -909).
 
diff --git a/Objects/stringlib/string_format.h b/Objects/stringlib/string_format.h
index ecb00a9a1e7..bc70e97be4b 100644
--- a/Objects/stringlib/string_format.h
+++ b/Objects/stringlib/string_format.h
@@ -373,6 +373,8 @@ FieldNameIterator_next(FieldNameIterator *self, int *is_attribute,
         if (_FieldNameIterator_item(self, name) == 0)
             return 0;
         *name_idx = get_integer(name);
+        if (*name_idx == -1 && PyErr_Occurred())
+            return 0;
         break;
     default:
         /* Invalid character follows ']' */
@@ -429,6 +431,8 @@ field_name_split(STRINGLIB_CHAR *ptr, Py_ssize_t len, SubString *first,
 
     /* see if "first" is an integer, in which case it's used as an index */
     *first_idx = get_integer(first);
+    if (*first_idx == -1 && PyErr_Occurred())
+        return 0;
 
     field_name_is_empty = first->ptr >= first->end;