diff --git a/vulnz/build.gradle b/vulnz/build.gradle
index d229c47a..996d696f 100644
--- a/vulnz/build.gradle
+++ b/vulnz/build.gradle
@@ -16,6 +16,7 @@ dependencies {
     implementation project(':open-vulnerability-store')
     implementation 'info.picocli:picocli-spring-boot-starter:4.7.4'
     implementation 'com.diogonunes:JColor:5.5.1'
+    implementation 'commons-io:commons-io:2.15.0'
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.15.2'
     implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.15.2'
     implementation 'jakarta.persistence:jakarta.persistence-api:3.1.0'
diff --git a/vulnz/src/main/java/io/github/jeremylong/vulnz/cli/commands/CveCommand.java b/vulnz/src/main/java/io/github/jeremylong/vulnz/cli/commands/CveCommand.java
index 7a5384f6..3cf91527 100644
--- a/vulnz/src/main/java/io/github/jeremylong/vulnz/cli/commands/CveCommand.java
+++ b/vulnz/src/main/java/io/github/jeremylong/vulnz/cli/commands/CveCommand.java
@@ -32,6 +32,7 @@
 import io.github.jeremylong.vulnz.cli.cache.CacheException;
 import io.github.jeremylong.vulnz.cli.cache.CacheProperties;
 import io.github.jeremylong.vulnz.cli.model.BasicOutput;
+import org.apache.commons.io.output.CountingOutputStream;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Component;
@@ -307,10 +308,13 @@ private Integer processRequest(NvdCveClientBuilder builder, CacheProperties prop
             } catch (NoSuchAlgorithmException e) {
                 throw new CacheException("Unable to calculate sha256 checksum", e);
             }
+            long byteCount = 0;
             try (FileOutputStream fileOutputStream = new FileOutputStream(file);
                     GZIPOutputStream gzipOutputStream = new GZIPOutputStream(fileOutputStream);
-                    DigestOutputStream digestOutputStream = new DigestOutputStream(gzipOutputStream, md);) {
-                objectMapper.writeValue(digestOutputStream, data);
+                    DigestOutputStream digestOutputStream = new DigestOutputStream(gzipOutputStream, md);
+                    CountingOutputStream countingOutputStream = new CountingOutputStream(digestOutputStream)) {
+                objectMapper.writeValue(countingOutputStream, data);
+                byteCount = countingOutputStream.getByteCount();
             } catch (IOException ex) {
                 throw new CacheException("Unable to write cached data: " + file, ex);
             }
@@ -320,6 +324,7 @@ private Integer processRequest(NvdCveClientBuilder builder, CacheProperties prop
                     PrintWriter writer = new PrintWriter(osw)) {
                 final String lmd = DateTimeFormatter.ISO_DATE_TIME.format(timestamp);
                 writer.println("lastModifiedDate:" + lmd);
+                writer.println("size: " + byteCount);
                 writer.println("gzSize:" + file.length());
                 writer.println("sha256:" + checksum);
             } catch (IOException ex) {