system: You are an expert security code reviewer. You will be shown a source code file along with a multi-select question listing several CWE (Common Weakness Enumeration) categories. Your task is to identify which of the listed CWEs are present in the code.

OUTPUT FORMAT: Respond with the letter(s) of all correct options, sorted alphabetically and comma-separated, wrapped in a single \boxed{...}. Examples: `\boxed{A}` for one correct, `\boxed{A,C}` for two, `\boxed{A,C,E}` for three. Output the boxed answer ONLY -- no explanation, no other text.

user: ```python
import io
import logging
import os
import shutil
from tempfile import TemporaryDirectory

import av
import jsonpickle
from flask import Flask, request
from tqdm import tqdm

logging.basicConfig(
    level=logging.DEBUG,
    format='%(asctime)s.%(msecs)03d %(levelname)s %(module)s - %(funcName)s: %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S',
)

app = Flask(__name__)
shutil.rmtree('./TEMP/', ignore_errors=True)


@app.route("/", methods=["POST"])
def extract_frames():
    """
    Receive everything in json!!!

    """
    app.logger.debug(f"Receiving data ...")
    data = request.json
    data = jsonpickle.decode(data)

    video = data['video']
    fps_max = data['fps_max']
    width_max = data['width_max']
    height_max = data['height_max']

    app.logger.debug(f"fps_max: {fps_max}, width_max: {width_max}, "
                     f"height_max: {height_max}")

    video = io.BytesIO(video)

    container = av.open(video)
    app.logger.info(f"{container} opened")

    metadata = {}
    fps_original = float(container.streams.video[0].average_rate)
    every_N = int(round(fps_original / fps_max))
    every_N = max(1, every_N)

    app.logger.info(f"Every {every_N} th frame will be processed.")

    with TemporaryDirectory() as tmpdir:
        app.logger.debug("Using temp directory %s", tmpdir)

        frames = []
        indexes = []
        for idx, frame in enumerate(container.decode(video=0)):
            if idx % every_N != 0:
                continue
            frame_save_path = os.path.join(tmpdir, f"{idx}.jpg")

            indexes.append(idx)
            app.logger.info(f"processing {idx} th frame ...")

            image = frame.to_image()
            app.logger.info(f"original width height {image.size}")

            width_original, height_original = image.size
            image.thumbnail(size=(width_max, height_max))
            app.logger.info(f"resized to {image.size}")

            frames.append(frame_save_path)
            app.logger.debug(f"saving the frame at {frame_save_path} "
                             f"temporarily before sending ...")
            image.save(frame_save_path)

        container.close()

        num_frames_original = idx + 1
        num_frames = len(frames)
        duration_seconds = num_frames_original / fps_original

        metadata['num_frames_original'] = num_frames_original
        metadata['num_frames'] = num_frames

        metadata['duration_seconds'] = duration_seconds
        metadata['fps_original'] = fps_original
        metadata['fps'] = len(frames) / duration_seconds

        metadata['width_original'] = width_original
        metadata['height_original'] = height_original
        metadata['width'], metadata['height'] = image.size

        metadata['frame_idx_original'] = indexes

        app.logger.info(f"metadata: {metadata}")

        app.logger.debug(f"Adding compressed frames ...")
        frames_binary = []
        for frame_save_path in tqdm(frames):
            with open(frame_save_path, 'rb') as stream:
                frames_binary.append(stream.read())

        response = {'frames': frames_binary,
                    'metadata': metadata}
        response_pickled = jsonpickle.encode(response)

    return response_pickled


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=10001)

```

Which of the following CWE vulnerability categories are present in this code? Multiple options may be correct.

  A) CWE-502: Deserialization of Untrusted Data
  B) CWE-117: Improper Output Neutralization for Logs
  C) CWE-732: Incorrect Permission Assignment for Critical Resource
  D) CWE-209: Generation of Error Message Containing Sensitive Information
  E) CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  F) CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Answer: A,B