pyLoad is vulnerable to attacks that bypass localhost restrictions, enabling the creation of arbitrary packages

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS

• CVE-2025-7346: 0.38% estimated exploitation activity in the next 30 days; percentile 31.68 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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/cnlblueprint.py#L21-L36 Below we see that the '/flash/add' endpoint uses the middleware above. https://github.com/pyload/pyload/blob/4159a1191ec4fe6d927e57a9c4bb8f54e16c381d/src/pyload/webui/app/blueprints/cnlblueprint.py#L56-L58C11 Notice how we are not authorized to access this endpoint when sending a request. However, if we set the Host header to be…

Published by the source

8 Jul 2025, 21:36 UTC

Last modified by the source

7 Jul 2026, 17:57 UTC

Source last checked

26 Oct 2026, 13:46 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-x698-5hjm-w2m5

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-x698-5hjm-w2m5

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# Patch Next advisory brief: CVE-2025-7346

Advisory: pyLoad is vulnerable to attacks that bypass localhost restrictions, enabling the creation of arbitrary packages
IDs: CVE-2025-7346, GHSA-x698-5hjm-w2m5
Record: https://patchnext.com/advisories/cve-2025-7346 (revision 2, source checked 26 Oct 2026, 13:46 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI pyload-ng: affected <= 0.5.0b3.dev88

## Suggested inspection (read-only)
- `python -m pip show pyload-ng`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pyload-ng.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-x698-5hjm-w2m5 (OSV record GHSA-x698-5hjm-w2m5 lists affected ranges: PyPI pyload-ng >=0 <=0.5.0b3.dev88)
- Verified: https://github.com/advisories/GHSA-x698-5hjm-w2m5 (GitHub-reviewed advisory GHSA-x698-5hjm-w2m5 lists affected ranges: PyPI pyload-ng >=0 <=0.5.0b3.dev88)

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