CVE-2026-102339
Dashboard / Vulnerabilities / CVE-2026-102339
Summary: Telepresence: Tunnel endpoint accepts caller-supplied session ID with no ownership proof — active client sessions hijackable
Details: 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.
References: https://github.com/telepresenceio/telepresence/releases/tag/v2.31.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102339.json, https://github.com/telepresenceio/telepresence/security/advisories/GHSA-6j3h-rp73-6rvf, https://nvd.nist.gov/vuln/detail/CVE-2026-102339, https://github.com/telepresenceio/telepresence/commit/1312482488b771742dbedd3015f9a81a27532de6, https://github.com/telepresenceio/telepresence/commit/36458b65a010d2b316af48cd90e193ba190785d9, https://github.com/telepresenceio/telepresence/pull/4217
Affected packages
Package
Name:
Purl:
