--- cups-1.3.6/filter/image-gif.c~	2008-03-27 11:50:12.000000000 -0400
+++ cups-1.3.6/filter/image-gif.c	2008-03-27 11:50:12.000000000 -0400
@@ -38,6 +38,8 @@
 #define GIF_INTERLACE	0x40
 #define GIF_COLORMAP	0x80
 
+#define MAX_LWZ_BITS	12
+
 typedef cups_ib_t	gif_cmap_t[256][4];
 typedef short		gif_table_t[4096];
 
@@ -461,6 +463,9 @@ gif_read_image(FILE         *fp,	/* I - 
   ypos      = 0;
   pass      = 0;
   code_size = getc(fp);
+  
+  if (code_size > MAX_LWZ_BITS)
+    return (-1);
 
   if (!pixels)
     return (-1);