diff -up libssh-0.10.4/include/libssh/sftp.h-cap libssh-0.10.4/include/libssh/sftp.h
--- libssh-0.10.4/include/libssh/sftp.h-cap	2023-09-19 11:28:41.304353437 +0200
+++ libssh-0.10.4/include/libssh/sftp.h	2023-09-19 11:34:20.828666252 +0200
@@ -550,6 +550,10 @@ LIBSSH_API int sftp_async_read(sftp_file
 /**
  * @brief Write to a file using an opened sftp file handle.
  *
+ * The maximum size of the SFTP packet payload is 32768 bytes so the count
+ * parameter is capped at this value. This is low-level function so it does not
+ * try to send more than this amount of data.
+ *
  * @param file          Open sftp file handle to write to.
  *
  * @param buf           Pointer to buffer to write data.
diff -up libssh-0.10.4/src/sftp.c-cap libssh-0.10.4/src/sftp.c
--- libssh-0.10.4/src/sftp.c-cap	2023-09-19 11:29:02.897569013 +0200
+++ libssh-0.10.4/src/sftp.c	2023-09-19 11:30:36.827506743 +0200
@@ -2179,6 +2179,16 @@ ssize_t sftp_write(sftp_file file, const
 
   id = sftp_get_new_id(file->sftp);
 
+  /* limit the writes to the maximum specified in Section 3 of
+   * https://datatracker.ietf.org/doc/html/draft-ietf-secsh-filexfer-02
+   *
+   * FIXME: This value should be adjusted to the value from the
+   * limits@openssh.com extension if supported
+   * TODO: We should iterate over the blocks rather than writing less than
+   * requested to provide less surprises to the calling applications.
+   */
+  count = count > 32768 ? 32768 : count;
+
   rc = ssh_buffer_pack(buffer,
                        "dSqdP",
                        id,