Index: unzip60/zipinfo.c
===================================================================
--- unzip60.orig/zipinfo.c
+++ unzip60/zipinfo.c
@@ -1927,7 +1927,18 @@ static int zi_short(__G)   /* return PK-
         ush  dnum=(ush)((G.crec.general_purpose_bit_flag>>1) & 3);
         methbuf[3] = dtype[dnum];
     } else if (methnum >= NUM_METHODS) {   /* unknown */
-        sprintf(&methbuf[1], "%03u", G.crec.compression_method);
+	/* 2016-12-05 SMS.
+	 * https://launchpad.net/bugs/1643750  CVE-2016-9844.
+	 * Unexpectedly large compression methods overflow
+	 * &methbuf[].  Use the old, three-digit decimal format
+	 * for values which fit.  Otherwise, sacrifice the "u",
+	 * and use four-digit hexadecimal.
+	 */
+	if (G.crec.compression_method <= 999) {
+	    sprintf( &methbuf[ 1], "%03u", G.crec.compression_method);
+	} else {
+	    sprintf( &methbuf[ 0], "%04X", G.crec.compression_method);
+	}
     }
 
     for (k = 0;  k < 15;  ++k)