# CVE-2025-7346: pyLoad authentication bypass via Host header spoofing in local_check

Source: https://junglewise.ai/threats/cve-2025-7346-pyload-authentication-bypass-via-host-header-spoofing-in-local  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-07-08. Updated: 2026-06-28  
License: CC BY 4.0 with a link back

CVE-2025-7346 · Severity: high · CVSS 7.5 · Published 2025-07-08

pyLoad, a popular open-source download manager, is vulnerable to an authentication bypass. An unauthorized attacker can trick the system into thinking a request is coming from the local server itself by manipulating network headers. This allows the attacker to perform administrative actions, such as creating arbitrary download packages, without needing a username or password.

Technologies: [pyload-ng (PyPI)](https://junglewise.ai/threats/technologies/pyload-ng). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2025-7346 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-7346 being exploited in the wild.

**How severe is CVE-2025-7346?** High severity, with a CVSS score of 7.5, published 8 July 2025.

**Which products and versions are affected?** pyload-ng (PyPI) <= 0.5.0b3.dev88, ECOSYSTEM:introduced=0,last_affected=0.5.0b3.dev88.

**Is there a fix for CVE-2025-7346?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-7346 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-7346?** Check whether you run pyload-ng (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability in pyLoad's 'local_check' middleware allows for an authentication bypass via Host header spoofing. The middleware validates whether a request is local by checking if the 'REMOTE_ADDR' is a loopback address or if the 'HTTP_HOST' header matches '127.0.0.1:9666' or '[::1]:9666'. Because the 'Host' header is user-controlled, a remote attacker can set this header to bypass the check. This grants access to restricted routes such as '/flash/add', enabling the creation of arbitrary download packages. The issue is tracked as CVE-2025-7346 and affects versions up to 0.5.0b3.dev88.

## Affected products

- pyLoad pyload-ng <= 0.5.0b3.dev88

## Identifiers

- CVE-2025-7346
- GHSA-x698-5hjm-w2m5
- PYSEC-2026-1822

## Timeline

- 2025-07-07: disclosed
- 2025-07-08: advisory: GHSA-x698-5hjm-w2m5 published

## References

- [https://api.github.com/users/PinkDraconian](https://api.github.com/users/PinkDraconian)
- [https://github.com/PinkDraconian](https://github.com/PinkDraconian)
- [https://api.github.com/users/PinkDraconian/gists%7B/gist_id%7D](https://api.github.com/users/PinkDraconian/gists%7B/gist_id%7D)
- [https://api.github.com/users/PinkDraconian/repos](https://api.github.com/users/PinkDraconian/repos)
- [https://avatars.githubusercontent.com/u/44903767?v=4](https://avatars.githubusercontent.com/u/44903767?v=4)
- [https://api.github.com/users/PinkDraconian/events%7B/privacy%7D](https://api.github.com/users/PinkDraconian/events%7B/privacy%7D)

## Related threats

- [pyLoad unauthenticated template access and information disclosure](https://junglewise.ai/threats/cve-2026-75597-pyload-unauthenticated-access-to-web-path-filename-bypasses)
- [pyLoad API denial of service in multipart file upload handling](https://junglewise.ai/threats/cve-2026-48484-pyload-lack-of-input-size-validation-leads-to-denial-of-service)
- [pyload-ng authentication bypass in getUserData/get_userdata](https://junglewise.ai/threats/pyload-ng-getuserdata-get-userdata-exposed-at-perms-any-allow-any-cd197c9d)
- [pyLoad rate-limit bypass and audit-log spoofing via X-Forwarded-For header](https://junglewise.ai/threats/pyload-rate-limit-bypass-and-audit-log-spoofing-via-trusted-client-0df0fd12)
- [pyLoad session invalidation bypass in privilege revocation and password change](https://junglewise.ai/threats/pyload-privilege-revocation-and-password-change-through-the-rest-api-do-8e7301ba)