Article: ProtonVPN IP Leakage on Linux and Workaround | PrivSec - A practical approach to Privacy and Security Killswitch does not work with all network interfaces. Can you be tested using following command curl --interface <physical interface> https://ipinfo.io Suggestion add an additional not…

[image] Encounter5729: I would agree that this issue in itself obviously doesn’t in itself merits delistment. I’m going to mark this topic (which is specifically about adding a warning to Proton VPN about this issue) as approved , because I think it is fairly reasonable for us to do, and it se…

Granted I’m not too technical, and not denying this may be an issue, but does the curl command not force the connection outside the VPN tunnel, thereby creating a leak?

For people reading, if you want to absolutely guarantee no VPN leak on desktop Linux, it is best to set it up with Wireguard via CLI where you can edit the config VPN file with a few lines of code to enable to killswitch. This way, all your traffic is routed through the encrypted tunnel even before…

Or if the user doesn’t need to switch VPN location frequently, apply a network wide VPN from router is also a good option.

May be. If the user is using their laptop or their smartphone, they are going to use it outside their home. Such a set up then is not useful.

[image] anon4692472: Granted I’m not too technical, and not denying this may be an issue, but does the curl command not force the connection outside the VPN tunnel, thereby creating a leak? In a hypothetical scenario, a bug or program could exploit this to obtain your real IP address. Since …

JG: If anyone is interested, I’d be happy to share more on how to do it. [image] anon61138815: Perhaps a post on the Wiki? I agree. @JG do u know if Fedora’s default vpn settings can leak? Ive been setting up wireguadd configs using fedora’s default graphical UI in the settings.

[image] anon61138815: Finally, there is a small number of Linux desktop users, which is fragmented into people who don’t use VPN, people who use other VPN providers, and finally Proton users. It’s also often recommended to bind your torrent client to the VPN interface to prevent leaks like th…

[image] anon61138815: However, it is public information that hypothetically puts real users at risk of exposure if an exploration with sole intent to deanomize takes advantage of this to discover its real IP. This would potentially involve a compromised application. I don’t say this shouldn’t…

[image] Encounter5729: 2- Are the two other recommended VPNs impacted (Mullvad and IVPN)? Just tested mullvad using the curl command and it does not appear to be affected

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ProtonVPN Additional note: Killswitch failure and IP Leakage on Linux

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anon36227541 December 15, 2025, 3:37pm 11

Workarounds were discussed here, but this thread is specifically about debating whether a change to the site should be added. I think that discussion is worth having.

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