diff --git a/WHATSNEW b/WHATSNEW
index 8077debb4..51f4ab55b 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -331,6 +331,11 @@ Fixed bugs:
  * <sort> resource collection kept only one of entries deemed equal by
    the chosen Comparator.  Bugzilla report 46527.
 
+ * the ZipFile class used by <unzip> and others could leave the
+   archive open (making it undeletable on Windows as long as the java
+   VM was running) for files with an unexpected internal structure.
+   Bugzilla Report 46559.
+
 Other changes:
 --------------
 
diff --git a/src/main/org/apache/tools/zip/ZipFile.java b/src/main/org/apache/tools/zip/ZipFile.java
index feed30d01..6a85f770a 100644
--- a/src/main/org/apache/tools/zip/ZipFile.java
+++ b/src/main/org/apache/tools/zip/ZipFile.java
@@ -150,16 +150,19 @@ public class ZipFile {
     public ZipFile(File f, String encoding) throws IOException {
         this.encoding = encoding;
         archive = new RandomAccessFile(f, "r");
+        boolean success = false;
         try {
             populateFromCentralDirectory();
             resolveLocalFileHeaderData();
-        } catch (IOException e) {
-            try {
-                archive.close();
-            } catch (IOException e2) {
-                // swallow, throw the original exception instead
+            success = true;
+        } finally {
+            if (!success) {
+                try {
+                    archive.close();
+                } catch (IOException e2) {
+                    // swallow, throw the original exception instead
+                }
             }
-            throw e;
         }
     }
 
diff --git a/src/tests/antunit/taskdefs/unzip-test.xml b/src/tests/antunit/taskdefs/unzip-test.xml
index cb4af6be5..ed75de469 100644
--- a/src/tests/antunit/taskdefs/unzip-test.xml
+++ b/src/tests/antunit/taskdefs/unzip-test.xml
@@ -43,4 +43,18 @@
            dest="${output}"/>
     <au:assertFileExists file="${output}/foo/file"/>
   </target>
+
+  <target name="testArchiveIsClosedForInvalidZips"
+          description="https://issues.apache.org/bugzilla/show_bug.cgi?id=46559"
+          >
+    <mkdir dir="${input}"/>
+    <mkdir dir="${output}"/>
+    <copy file="zip/Bugzilla-46559.zip" tofile="${input}/test.zip"/>
+    <au:expectfailure>
+      <unzip src="${input}/test.zip" dest="${output}"/>
+    </au:expectfailure>
+    <delete file="${input}/test.zip" quiet="true"/>
+    <!-- failed on Windows and other OSes with implicit file locking -->
+    <au:assertFileDoesntExist file="${input}/test.zip"/>
+  </target>
 </project>
diff --git a/src/tests/antunit/taskdefs/zip/Bugzilla-42940.zip b/src/tests/antunit/taskdefs/zip/Bugzilla-42940.zip
new file mode 100644
index 000000000..2f7566082
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diff --git a/src/tests/antunit/taskdefs/zip/Bugzilla-46559.zip b/src/tests/antunit/taskdefs/zip/Bugzilla-46559.zip
new file mode 100644
index 000000000..2f7566082
Binary files /dev/null and b/src/tests/antunit/taskdefs/zip/Bugzilla-46559.zip differ