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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | pyload-ng | <= 0.5.0b3.dev88 | no fix |
References
- 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
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- Weakness (CWE)
CWE-284, CWE-290- Platform
- Python (PyPI)
- Package
pyload-ng- Disclosed
- 08.07.2025
- Updated
- 11.10.2026 13:19
Sources and licenses
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
Vulnerability history: pyload-ng
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 58
- First → latest
- 01.2023 10.2026
- Without a fix
- 24
- Exploited in attacks
- 0
Severity breakdown
- Critical 9
- High 23
- Medium 25
- Low 1
Disclosures per year
- 2023: 9
- 2024: 8
- 2025: 8
- 2026: 33
-
pyLoad is vulnerable to attacks that bypass localhost restrictions, enabling the creation of arbitrary packages this entry
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