[BUG] 5.2.X - Run external program -> Crash

[Bugbavka]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

On 5.2.0 - 5.2.3 enabling Run external program (Run on torrent added) will crash the WebUI when this command is run.
This issue is not present on 5.1.4.

Expected Behavior

Run external program (Run on torrent added) not crashing on 5.2.X.

Steps To Reproduce

1. Create clean container with with tag :5.2.X
2. Login to WebUI
3. Settings - enable Run on torrent added and add legitimate command like (curl -s -X POST --data-urlencode "hashes=%K" "http://127.0.0.1:8888/api/v2/torrents/toggleSequentialDownload" "http://127.0.0.1:8888/api/v2/torrents/toggleFirstLastPiecePrio" or just for testing echo test or touch /config/test)
4. Add any torrent
5. Crash - WebUI is no longer responding, docker container log does not produce any new output

Environment

- OS: Debian 13.6
- How docker service was installed: APT - docker.io package (26.1.5+dfsg1-9+b13 amd64)

CPU architecture

x86-64

Docker creation

services:
  qbittorrent:
    image: lscr.io/linuxserver/qbittorrent:5.2.3
    container_name: qbittorrent
    #user: "999:996" # root / rootless does not make difference
    volumes:
      - "./config-tst:/config"
      #- "./down:/downloads"
    environment:
      - "TZ=Europe/Prague"
      - "PUID=999"
      - "PGID=996"
      - "WEBUI_PORT=8888"
      - "TORRENTING_PORT=60944"
    ports:
      - 60944:60944/tcp
      - 60944:60944/udp
      - 8888:8888
    labels:
      - "diun.enable=true"
    restart: unless-stopped
    networks:
      docket_net_p2p:
        ipv4_address: X.X.X.X
    stop_grace_period: 65s
    mem_limit: 2g
    cpus: 2
    healthcheck:
      test: curl --fail http://127.0.0.1:$${WEBUI_PORT}/ || exit 1
      interval: 90s
      retries: 5
      start_period: 5s
      timeout: 15s
    logging:
      driver: json-file
      options:
        max-size: "50m"
        max-file: "5"

networks:
  docket_net_p2p:
    external: true

Container logs

qbittorrent  | [migrations] started
qbittorrent  | [migrations] no migrations found
qbittorrent  | usermod: no changes
qbittorrent  | ───────────────────────────────────────
qbittorrent  | 
qbittorrent  |       ██╗     ███████╗██╗ ██████╗
qbittorrent  |       ██║     ██╔════╝██║██╔═══██╗
qbittorrent  |       ██║     ███████╗██║██║   ██║
qbittorrent  |       ██║     ╚════██║██║██║   ██║
qbittorrent  |       ███████╗███████║██║╚██████╔╝
qbittorrent  |       ╚══════╝╚══════╝╚═╝ ╚═════╝
qbittorrent  | 
qbittorrent  |    Brought to you by linuxserver.io
qbittorrent  | ───────────────────────────────────────
qbittorrent  | 
qbittorrent  | To support LSIO projects visit:
qbittorrent  | https://www.linuxserver.io/donate/
qbittorrent  | 
qbittorrent  | ───────────────────────────────────────
qbittorrent  | GID/UID
qbittorrent  | ───────────────────────────────────────
qbittorrent  | 
qbittorrent  | User UID:    999
qbittorrent  | User GID:    996
qbittorrent  | ───────────────────────────────────────
qbittorrent  | Linuxserver.io version: 5.2.3_v2.0.13-ls469
qbittorrent  | Build-date: 2026-07-19T09:01:18+00:00
qbittorrent  | ───────────────────────────────────────
qbittorrent  |     
qbittorrent  | [custom-init] No custom files found, skipping...
qbittorrent  | WebUI will be started shortly after internal preparations. Please wait...
qbittorrent  | 
qbittorrent  | ******** Information ********
qbittorrent  | To control qBittorrent, access the WebUI at: http://localhost:8888
qbittorrent  | The WebUI administrator username is: admin
qbittorrent  | The WebUI administrator password was not set. A temporary password is provided for this session: Q6t83nYnB
qbittorrent  | You should set your own password in program preferences.
qbittorrent  | Connection to localhost (::1) 8888 port [tcp/*] succeeded!
qbittorrent  | [ls.io-init] done.

[j0nnymoe]

Any errors in the actual application logs? Not the container logs.

[Bugbavka]

Any errors in the actual application logs? Not the container logs.

Same as the other issue, log (qbittorrent.log) does not contain any new entries after trying to add new torrent.

[Bugbavka]

Bug is related to Debian older docker.io package in repo, works correctly on latest docker-ce.