Index: src/util.c
==================================================================
--- src/util.c
+++ src/util.c
@@ -329,11 +329,11 @@
     }else if( *z=='+' ){
       z+=incr;
     }
     /* copy digits to exponent */
     while( z<zEnd && sqlite3Isdigit(*z) ){
-      e = e*10 + (*z - '0');
+      e = e<10000 ? (e*10 + (*z - '0')) : 10000;
       z+=incr;
       eValid = 1;
     }
   }
 

Index: test/nan.test
==================================================================
--- test/nan.test
+++ test/nan.test
@@ -317,9 +317,55 @@
   db eval {DELETE FROM t1}
   set big [string repeat 9 10000].0e-9000
   db eval "INSERT INTO t1 VALUES($big)"
   db eval {SELECT x, typeof(x) FROM t1}
 } {inf real}
+
+do_realnum_test nan-4.30 {
+  db eval {
+    DELETE FROM t1;
+    INSERT INTO t1 VALUES('2.5e+9999');
+    SELECT x, typeof(x) FROM t1;
+  }
+} {inf real}
+do_realnum_test nan-4.31 {
+  db eval {
+    DELETE FROM t1;
+    INSERT INTO t1 VALUES('2.5e+10000');
+    SELECT x, typeof(x) FROM t1;
+  }
+} {inf real}
+
+do_realnum_test nan-4.32 {
+  db eval {
+    DELETE FROM t1;
+    INSERT INTO t1 VALUES('2.5e-9999');
+    SELECT x, typeof(x) FROM t1;
+  }
+} {0.0 real}
+do_realnum_test nan-4.33 {
+  db eval {
+    DELETE FROM t1;
+    INSERT INTO t1 VALUES('2.5e-10000');
+    SELECT x, typeof(x) FROM t1;
+  }
+} {0.0 real}
+do_realnum_test nan-4.34 {
+  db eval {
+    DELETE FROM t1;
+    INSERT INTO t1 VALUES('2.5e2147483650');
+    SELECT x, typeof(x) FROM t1;
+  }
+} {inf real}
+do_realnum_test nan-4.35 {
+  db eval {
+    DELETE FROM t1;
+    INSERT INTO t1 VALUES('2.5e-2147483650');
+    SELECT x, typeof(x) FROM t1;
+  }
+} {0.0 real}
+
+  
 
 
 
 finish_test