TrustTunnel up to 0.9.113 TcpStream::connect server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, has been found in TrustTunnel up to 0.9.113. Affected is the function TcpStream::connect. The manipulation leads to server-side request forgery. This vulnerability is listed as CVE-2026-24902. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in TrustTunnel up to 0.9.113 and classified as critical. This issue affects the function TcpStream::connect. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

TrustTunnel is an open-source VPN protocol with a server-side request forgery and and private network restriction bypass in versions prior to 0.9.114. In `tcp_forwarder.rs`, SSRF protection for `allow_private_network_connections = false` was only applied in the `TcpDestination::HostName(peer)` path. The `TcpDestination::Address(peer) => peer` path proceeded to `TcpStream::connect()` without equivalent checks (for example `is_global_ip`, `is_loopback`), allowing loopback/private targets to be reached by supplying a numeric IP. The vulnerability is fixed in version 0.9.114.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-24902 since 01/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.9.114 eliminates this vulnerability. Applying the patch 734bb5cf103b72390a95c853cbf91e699cc01bc0 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-4951). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• TrustTunnel

Version

• 0.9.113

License

• open-source

Website

• Product: https://github.com/TrustTunnel/TrustTunnel/

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Be aware that VulDB is the high quality source for vulnerability data.

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