From 4d5d303a96c8cd17afbe0db7c01cafbaa9668338 Mon Sep 17 00:00:00 2001
From: Daijiro Wachi <daijiro.wachi@gmail.com>
Date: Sun, 19 Apr 2026 18:18:51 +0900
Subject: [PATCH] stream: ensuring cross-destruction in _duplexify to prevent
 leaks

---
 lib/internal/streams/duplexify.js        |  2 +-
 test/parallel/test-stream-duplex-from.js | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/lib/internal/streams/duplexify.js b/lib/internal/streams/duplexify.js
index bd51e4fb4f0b7c..0c6701fa271110 100644
--- a/lib/internal/streams/duplexify.js
+++ b/lib/internal/streams/duplexify.js
@@ -334,7 +334,7 @@ function _duplexify(pair) {
     eos(r, (err) => {
       readable = false;
       if (err) {
-        destroyer(r, err);
+        destroyer(w, err);
       }
       onfinished(err);
     });
diff --git a/test/parallel/test-stream-duplex-from.js b/test/parallel/test-stream-duplex-from.js
index 631b3586b36191..e12599fed17c14 100644
--- a/test/parallel/test-stream-duplex-from.js
+++ b/test/parallel/test-stream-duplex-from.js
@@ -401,3 +401,20 @@ function makeATestWritableStream(writeFunc) {
     assert.strictEqual(d.writable, false);
   }));
 }
+
+// When the readable side errors, the error must propagate to the writable side.
+{
+  const expectedErr = new Error('readable error');
+  const r = new Readable({ read() {} });
+  const w = new Writable({
+    write(chunk, encoding, callback) { callback(); },
+  });
+  const d = Duplex.from({ readable: r, writable: w });
+  d.on('error', common.mustCall((err) => {
+    assert.strictEqual(err, expectedErr);
+  }));
+  w.on('error', common.mustCall((err) => {
+    assert.strictEqual(err, expectedErr);
+  }));
+  r.destroy(expectedErr);
+}