--- freem/src/ssvn.c	2025/03/09 19:50:47	1.3
+++ freem/src/ssvn.c	2025/04/09 15:16:50	1.4
@@ -1,5 +1,5 @@
 /*
- *   $Id: ssvn.c,v 1.3 2025/03/09 19:50:47 snw Exp $
+ *   $Id: ssvn.c,v 1.4 2025/04/09 15:16:50 snw Exp $
  *    structured system variable support
  *
  *  
@@ -24,6 +24,9 @@
  *   along with FreeM.  If not, see <https://www.gnu.org/licenses/>.
  *
  *   $Log: ssvn.c,v $
+ *   Revision 1.4  2025/04/09 15:16:50  snw
+ *   Fix buffer overruns in mref_to_external and ssvn.c
+ *
  *   Revision 1.3  2025/03/09 19:50:47  snw
  *   Second phase of REUSE compliance and header reformat
  *
@@ -112,7 +115,11 @@ void ssvn (short action, char *key, char
     int i, j;
     char ch;
     char ptmp[256];
+    char sbuf[256];
 
+    snprintf (sbuf, sizeof (sbuf), " C CHARACTER D DEVICE DI DISPLAY E EVENT G GLOBAL J JOB LI LIBRARY L LOCK O OBJECT P R ROUTINE S SYSTEM W WINDOW \201");
+    
+    
     if ((rtn_dialect () == D_M77) ||
         (rtn_dialect () == D_M84) ||
         (rtn_dialect () == D_M90)) {
@@ -146,7 +153,7 @@ void ssvn (short action, char *key, char
 
     if ((ptmp[1] != 'Z') && (ptmp[1] != 'Y')) {
 
-        if (find (" C CHARACTER D DEVICE DI DISPLAY E EVENT G GLOBAL J JOB LI LIBRARY L LOCK O OBJECT P R ROUTINE S SYSTEM W WINDOW ", ptmp) == FALSE) {
+        if (find (sbuf, ptmp) == FALSE) {
             merr_raise (M60);
             return;
         }