November 13, 2026 Follow Egret
CVE-2026-102339 · CVE record: PUBLISHED

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

telepresenceio telepresence

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.

Exploitation evidence

Not listed in the latest downloaded CISA KEV catalog. This does not establish an absence of exploitation.

KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗

Reported products and versions

telepresenceio / telepresence

Default status: Not specified

  • affected: < 2.31.0

Fixes and workarounds

No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.

Sources and related reporting

CVE Program record ↗ · Download tracked evidence as JSON

Monitored source mentions

Shared CVE identifiers link source mentions; they do not establish that the reports describe the same incident.

Observed change timeline

History begins when Egret first downloads each source. It is not the complete upstream CVE history.

12 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-12",
  "epss": 0.00287,
  "percentile": 0.21481
}
10 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-10",
  "epss": 0.00287,
  "percentile": 0.21397
}
10 Nov 2026, 12:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-09",
  "epss": 0.00287,
  "percentile": 0.21357
}
10 Nov 2026, 12:20 Jerusalem · CVE Program record changed

Stored CNA snapshot at this observation.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-102339",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-09T16:11:38.687798Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-09T16:59:56.924Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "telepresence",
          "vendor": "telepresenceio",
          "versions": [
            {
              "status": "affected",
              "version": "< 2.31.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-04T20:35:34.030Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/telepresenceio/telepresence/security/advisories/GHSA-6j3h-rp73-6rvf",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/telepresenceio/telepresence/security/advisories/GHSA-6j3h-rp73-6rvf"
        },
        {
          "name": "https://github.com/telepresenceio/telepresence/pull/4217",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/telepresenceio/telepresence/pull/4217"
        },
        {
          "name": "https://github.com/telepresenceio/telepresence/commit/1312482488b771742dbedd3015f9a81a27532de6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/telepresenceio/telepresence/commit/1312482488b771742dbedd3015f9a81a27532de6"
        },
        {
          "name": "https://github.com/telepresenceio/telepresence/commit/36458b65a010d2b316af48cd90e193ba190785d9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/telepresenceio/telepresence/commit/36458b65a010d2b316af48cd90e193ba190785d9"
        },
        {
          "name": "https://github.com/telepresenceio/telepresence/releases/tag/v2.31.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/telepresenceio/telepresence/releases/tag/v2.31.0"
        }
      ],
      "source": {
        "advisory": "GHSA-6j3h-rp73-6rvf",
        "discovery": "UNKNOWN"
      },
      "title": "Telepresence: Tunnel endpoint accepts caller-supplied session ID with no ownership proof — active client sessions hijackable"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-102339",
    "datePublished": "2026-11-04T20:35:34.030Z",
    "dateReserved": "2026-09-28T22:38:42.254Z",
    "dateUpdated": "2026-11-09T16:59:56.924Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}
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