Telepresence: Tunnel endpoint accepts caller-supplied session ID with no ownership proof — active client sessions hijackable

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102339
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 21:17:40 UTC
Updated2026-11-09 17:17:05 UTC
DescriptionTelepresence 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS: 0.002870000 probability, percentile 0.213570000 (date 2026-11-09)

Problem Types: CWE-639 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Telepresenceio Telepresence affected < 2.31.0 Not specified

References

ReferenceSourceLinkTags
github.com/telepresenceio/telepresence/releases/tag/v2.31.0 [email protected] github.com
github.com/telepresenceio/telepresence/commit/1312482488b771742dbedd3015... [email protected] github.com
github.com/telepresenceio/telepresence/security/advisories/GHSA-6j3h-rp7... [email protected] github.com
github.com/telepresenceio/telepresence/commit/36458b65a010d2b316af48cd90... [email protected] github.com
github.com/telepresenceio/telepresence/pull/4217 [email protected] github.com
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