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Vulnerability · Published Nov 4, 2026 · Assigned by GitHub_M

CVE-2026-102339Telepresence: Tunnel endpoint accepts caller-supplied session ID with no ownership proof — active client sessions hijackable

High 8.2

In plain English

A high-severity authorization bypass via user-controlled key in telepresence from telepresenceio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.3%top 78.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

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.

Affected products (as reported)

VendorProductVersions
telepresenceio telepresence < 2.31.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

References