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

Quick assessment

Affected
telepresenceio telepresence
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Telepresence 支持针对远程 Kubernetes 或 OpenShift 集群进行本地开发。在 2.31.0 版本之前，Traffic Manager 隧道 gRPC 流式端点会在 中从调用者控制的消息前几个字节解析会话 ID，并将其传递给 ，但并未验证调用者是否拥有该活跃会话的所有权。攻击者若通过日志泄露、集群内部通道或未认证的 端点获取到有效的活跃会话 ID，即可将路由隧道附加到该会话，从而获得其网络路由能力。由于会话 ID 采用 UUID4 格式，冷暴力破解在实际中并不可行。该漏洞已在 2.31.

CVSS 8.2 · High
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I. Basic Information for CVE-2026-102339

Vulnerability Information
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Vulnerability Title
Telepresence: Tunnel endpoint accepts caller-supplied session ID with no ownership proof — active client sessions hijackable
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
telepresenceio telepresence < 2.31.0 -

II. Public POCs for CVE-2026-102339

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III. Intelligence Information for CVE-2026-102339

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Other References for CVE-2026-102339 (5)

IV. Related Vulnerabilities

Same product: telepresence
Same vendor: telepresenceio
Same weakness: CWE-639