Index: generic/nsf.c
===================================================================
diff -u -N -r8ea1d85cc1e213c8a8f661d6aeb58690c6f7a6a0 -r53a9c013e5405281619839baee21d3d33b77d53e
--- generic/nsf.c	(.../nsf.c)	(revision 8ea1d85cc1e213c8a8f661d6aeb58690c6f7a6a0)
+++ generic/nsf.c	(.../nsf.c)	(revision 53a9c013e5405281619839baee21d3d33b77d53e)
@@ -26837,7 +26837,7 @@
     char buffer[BUFSIZE];
 
     for (i = 0; i < CAPPEDSIZE && i < obj->length; i++) {
-      snprintf(buffer + i*2, BUFSIZE, "%.2x", (unsigned)(*((obj->bytes)+i) & 0xff));
+      snprintf(buffer + i*2, BUFSIZE - (i+1)*2, "%.2x", (unsigned)(*((obj->bytes)+i) & 0xff));
     }
     if (obj->length > CAPPEDSIZE) {
       strncat(buffer, trailerStr, (BUFSIZE-CAPPEDSIZE*2u));