Advisory details:
pypa / pyload-ng/PYSEC-2026-1822
| Advisory ID | pypa/pyload-ng/PYSEC-2026-1822 |
| Aliases |
CVE-2025-7346
GHSA-x698-5hjm-w2m5 PYSEC-2026-1822 |
| Summary | 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. https://github.com/pyload/pyload/blob/4159a1191ec4fe6d927e57a9c4bb8f54e16c381d/src/pyload/webui/app/blueprints/cnl_blueprint.py#L21-L36 ```python #: 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 wrapper ``` Below we see that the '/flash/add' endpoint uses the middleware above. https://github.com/pyload/pyload/blob/4159a1191ec4fe6d927e57a9c4bb8f54e16c381d/src/pyload/webui/app/blueprints/cnl_blueprint.py#L56-L58C11 ```python @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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.8 |
| Risk | 3.4 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| There are no known CWE. |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 7.5 | https://github.com/pypa/advisory-database/blob/main/vulns/pyload-ng/PYSEC-2026-1822.yaml |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2025-07-08T14:13:19Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/7xxx/CVE-2025-7346.json
Source Advisory: vulnrichment/CVE-2025-7346
[{'Exploitation': 'poc'},
{'Automatable': 'yes'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]