Telepresenceio Telepresence up to 2.30.x Traffic Manager Tunnel gRPC Streaming Endpoint pkg/tunnel/message.go improper authorization

Summaryinfo

A vulnerability categorized as critical has been discovered in Telepresenceio Telepresence up to 2.30.x. Affected by this vulnerability is an unknown functionality of the file pkg/tunnel/message.go of the component Traffic Manager Tunnel gRPC Streaming Endpoint. Such manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-102339. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Telepresenceio Telepresence up to 2.30.x and classified as critical. Affected by this issue is an unknown functionality of the file pkg/tunnel/message.go of the component Traffic Manager Tunnel gRPC Streaming Endpoint. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Telepresence enables local development against a remote Kubernetes or OpenShift cluster. Prior to 2.31.0, the Traffic Manager Tunnel gRPC streaming endpoint parses a session ID from the first bytes of a caller-controlled message in pkg/tunnel/message.go and passes it to state.Tunnel without verifying that the caller owns the active session. An attacker who obtains a valid active session ID through log leakage, cluster-internal channels, or the unauthenticated ArriveAsClient endpoint can attach a routed tunnel to that session and gain its network routing capabilities. UUID4 session IDs make cold brute force impractical. This vulnerability is fixed in 2.31.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-102339 since 09/29/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 2.31.0 eliminates this vulnerability.

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Productinfo

Vendor

• Telepresenceio

Name

• Telepresence

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24
• 2.25
• 2.26
• 2.27
• 2.28
• 2.29
• 2.30

Website

• Product: https://github.com/telepresenceio/telepresence/

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