The following code is flagged as dead (since it's *replacing* rather than updating the existing Object):
https://github.com/mozilla/pdf.js/blob/4483cba72410027acf46630ebf252ae529704476/src/core/xfa/template.js#L2336-L2339
according to the alert in https://github.com/mozilla/pdf.js/security/code-scanning/103?query=ref%3Arefs%2Fheads%2Fmaster

Looking at the surrounding code, I can see a couple of possibilities here:
 1. This is indeed just dead code, which should be removed.
 2. The code should be moved up, and placed just *above* the previous block instead.
 3. There should be other, more invasive, changes made to this code...

/cc @calixteman Which solution is correct here?
Assuming it's either option 1 or 2, I can submit a patch to fix this.
constructor(attributes) {
    super(TEMPLATE_NS_ID, "submit",  true);
    this.embedPDF = getInteger({
      data: attributes.embedPDF,
      defaultValue: 0,
      validate: x => x === 1,
    });
    this.format = getStringOption(attributes.format, [
      "xdp",
      "formdata",
      "pdf",
      "urlencoded",
      "xfd",
      "xml",
    ]);
    this.id = attributes.id || "";
    this.target = attributes.target || "";
    this.textEncoding = getKeyword({
      data: attributes.textEncoding
        ? attributes.textEncoding.toLowerCase()
        : "",
      defaultValue: "",
      validate: k =>
        [
          "utf-8",
          "big-five",
          "fontspecific",
          "gbk",
          "gb-18030",
          "gb-2312",