Bug 2567449 (CVE-2026-102339)

Summary: CVE-2026-102339 github.com/telepresenceio/telepresence: Telepresence: Unauthorized network routing access via missing session ownership verification
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Telepresence. The Traffic Manager Tunnel service processes session identifiers from caller-controlled messages without verifying that the caller owns the active session. An attacker who obtains a valid session identifier can connect to the tunnel endpoint to hijack another user's session, gaining unauthorized network routing access within the connected cluster.
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Description OSIDB Bzimport 2026-11-05 21:58:45 UTC 
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.