pyLoad is vulnerable to attacks that bypass localhost restrictions, enabling the creation of arbitrary packages
Summary
Any unauthenticated attacker can bypass the localhost restrictions posed by the application and utilize this to create arbitrary packages.
Details
Any unauthenticated attacker can bypass the localhost restrictions posed by the application and utilize this to create arbitrary packages. This is done by changing the Host header to the value of 127.0.0.1:9666.
PoC
The application has middleware that prevents access to several routes by checking whether the Host header has a specific value. We bypassed this restriction.
#: decorator
def local_check(func):
@wraps(func)
def wrapper(*args, **kwargs):
remote_addr = flask.request.environ.get("REMOTE_ADDR", "0")
http_host = flask.request.environ.get("HTTP_HOST", "0")
if remote_addr in ("127.0.0.1", "::ffff:127.0.0.1", "::1", "localhost") or http_host in (
"127.0.0.1:9666",
"[::1]:9666",
):
return func(*args, **kwargs)
else:
return "Forbidden", 403
return wrapperBelow we see that the '/flash/add' endpoint uses the middleware above.
@bp.route("/flash/add", methods=["POST"], endpoint="add")
@local_check
def add():Notice how we are not authorized to access this endpoint when sending a request.
However, if we set the Host header to be 127.0.0.1:9666, we notice the request returns success.
Checking the front end as an admin, we now see that this did indeed succeed.
Impact
An unauthenticated user can perform actions that should only be available to authenticated users.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | pyload-ng | <= 0.5.0b3.dev88 | sin corrección |
Referencias
- https://github.com/pyload/pyload/security/advisories/GHSA-x698-5hjm-w2m5
- https://github.com/pyload/pyload/commit/f4e2d12416ba2dfac7b036d5c8d6dab5461b9840
- https://github.com/pyload/pyload
- https://github.com/pyload/pyload/blob/4159a1191ec4fe6d927e57a9c4bb8f54e16c381d/src/pyload/webui/app/blueprints/cnl_blueprint.py#L21-L36
- https://github.com/pyload/pyload/blob/4159a1191ec4fe6d927e57a9c4bb8f54e16c381d/src/pyload/webui/app/blueprints/cnl_blueprint.py#L56-L58C11
- https://pypi.org/project/pyload-ng
- https://github.com/advisories/GHSA-x698-5hjm-w2m5
- https://nvd.nist.gov/vuln/detail/CVE-2025-7346
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- Debilidad (CWE)
CWE-284, CWE-290- Plataforma
- Python (PyPI)
- Paquete
pyload-ng- Publicada
- 08.07.2025
- Actualizado
- 11.10.2026 13:19
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-1822 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-x698-5hjm-w2m5 - CC BY 4.0
Historial de vulnerabilidades: pyload-ng
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 58
- Primera → última
- 01.2023 10.2026
- Sin corrección
- 24
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 9
- Alta 23
- Media 25
- Baja 1
Divulgaciones por año
- 2023: 9
- 2024: 8
- 2025: 8
- 2026: 33
-
pyLoad is vulnerable to attacks that bypass localhost restrictions, enabling the creation of arbitrary packages esta entrada
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