From 5c4845814ab2da53b30144d8545a7f8b4ef6e66f Mon Sep 17 00:00:00 2001
From: Ulf Jaenicke-Roessler <ujr@insynergie.de>
Date: Fri, 3 Apr 2026 22:11:34 +0200
Subject: [PATCH 1/2] test: test case showing bug handing wrong position over
 to callback

---
 test/test-sftp.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/test-sftp.js b/test/test-sftp.js
index 595e5091..2f42e92b 100644
--- a/test/test-sftp.js
+++ b/test/test-sftp.js
@@ -105,10 +105,12 @@ setup('read (overflow)', mustCall((client, server) => {
     if (reqs === 3)
       server.end();
   }, 3));
-  client.read(handle_, buf, 0, buf.length, 0, mustCall((err, nb) => {
+  const reqPos = 0
+  client.read(handle_, buf, 0, buf.length, reqPos, mustCall((err, nb, _retBuf, retPos) => {
     assert(!err, `Unexpected read() error: ${err}`);
     assert.deepStrictEqual(buf, expected);
     assert.strictEqual(nb, buf.length, 'read nb mismatch');
+    assert.strictEqual(reqPos, retPos, 'read ressource position does not match request');
   }));
 }));
 

From fad473ba4173a0c6468e864c85e6fa16fb54c9f2 Mon Sep 17 00:00:00 2001
From: Ulf Jaenicke-Roessler <ujr@insynergie.de>
Date: Fri, 3 Apr 2026 22:13:03 +0200
Subject: [PATCH 2/2] fix: give actual base position to callback

---
 lib/protocol/SFTP.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/protocol/SFTP.js b/lib/protocol/SFTP.js
index 9f33c021..19fcc8c4 100644
--- a/lib/protocol/SFTP.js
+++ b/lib/protocol/SFTP.js
@@ -2136,6 +2136,7 @@ function read_(self, handle, buf, off, len, position, cb, req_) {
   const req = (req_ || {
     nb: 0,
     position,
+    origPosition: position,
     off,
     origOff: off,
     len: undefined,
@@ -2162,7 +2163,7 @@ function read_(self, handle, buf, off, len, position, cb, req_) {
         data = buf;
       else
         data = bufferSlice(buf, req.origOff, req.origOff + req.nb + nb);
-      cb(undefined, req.nb + nb, data, req.position);
+      cb(undefined, req.nb + nb, data, req.origPosition);
     },
     buffer: undefined,
   });