Vulnerability details
CVE-2026-102339
Telepresence: Tunnel endpoint accepts caller-supplied session ID with no ownership proof — active client sessions hijackable
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.2High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| telepresenceio | telepresence | < 2.31.0 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://github.com/telepresenceio/telepresence/security/advisories/GHSA-6j3h-rp73-6rvf x_refsource_CONFIRM
- https://github.com/telepresenceio/telepresence/pull/4217 x_refsource_MISC
- https://github.com/telepresenceio/telepresence/commit/1312482488b771742dbedd3015f9a81a27532de6 x_refsource_MISC
- https://github.com/telepresenceio/telepresence/commit/36458b65a010d2b316af48cd90e193ba190785d9 x_refsource_MISC
- https://github.com/telepresenceio/telepresence/releases/tag/v2.31.0 x_refsource_MISC
Details
- Published
- 2026-11-05
- Last updated
- 2026-11-05
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
Weaknesses (CWE)
- CWE-639Authorization Bypass Through User-Controlled Key