CVE-2026-18677 (GCVE-0-2026-18677)

Vulnerability from cvelistv5 – Published: 2026-08-12 18:47 – Updated: 2026-08-13 14:49
VLAI
Title
Kong Mesh: a dataplane token without a workload binding can claim any workload's SPIFFE identity
Summary
In Kong Mesh running in universal mode with a MeshIdentity whose SPIFFE ID path template derives from the dataplane's kuma.io/workload label, the XDS authenticator in kuma-cp validates that label only when the dataplane token is bound to a workload. Workload binding is optional, so a dataplane presenting a tags-bound token can register with kuma.io/workload set to any value and obtain another workload's SPIFFE identity.
Severity
6 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:49 UTC
CWE
  • CWE-290 - Authentication Bypass by Spoofing
Assigner
References
Impacted products
Vendor Product Version
Kong Inc. Kong Mesh Affected: 2.13.0 , < 2.13.10 (semver)
Affected: 2.14.0 , < 2.14.2 (semver)
Create a notification for this product.
Credits
kanywst
Show details on NVD website
To clipboard 

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Workload binding is optional, so a dataplane presenting a tags-bound token can register with \u003ccode\u003ekuma.io/workload\u003c/code\u003e set to any value and obtain another workload\u0027s SPIFFE identity.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-290\", \"description\": \"CWE-290 Authentication Bypass by Spoofing\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"You are affected if all of the following hold:\\n\\n  *  The control plane runs in universal mode.\\n  *  A MeshIdentity is configured whose SPIFFE ID path template derives from the workload label, including the default universal template /workload/{{ .Workload }}.\\n  *  Dataplanes authenticate with tokens that are not bound to a workload (tags-bound tokens, the common case, since workload binding is newer and optional).\\n\\n\\n\\n\\nYou are not affected if:\\n\\n  *  The control plane runs in Kubernetes mode. Its identity template is /ns/{{ .Namespace }}/sa/{{ .ServiceAccount }}, and the control plane derives those values from the pod\u0027s real identity rather than from a label the workload sets.\\n  *  Your MeshIdentity uses a SPIFFE template that does not reference the workload label.\\n  *  Every dataplane whose identity derives from the workload label already uses a workload-bound token.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eYou are affected if all of the following hold:\u003c/p\u003e\u003cul\u003e\u003cli\u003eThe control plane runs in universal mode.\u003c/li\u003e\u003cli\u003eA \u003ccode\u003eMeshIdentity\u003c/code\u003e is configured whose SPIFFE ID path template derives from the workload label, including the default universal template \u003ccode\u003e/workload/{{ .Workload }}\u003c/code\u003e.\u003c/li\u003e\u003cli\u003eDataplanes authenticate with tokens that are not bound to a workload (tags-bound tokens, the common case, since workload binding is newer and optional).\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eYou are not affected if:\u003c/p\u003e\u003cul\u003e\u003cli\u003eThe control plane runs in Kubernetes mode. Its identity template is \u003ccode\u003e/ns/{{ .Namespace }}/sa/{{ .ServiceAccount }}\u003c/code\u003e, and the control plane derives those values from the pod\u0027s real identity rather than from a label the workload sets.\u003c/li\u003e\u003cli\u003eYour \u003ccode\u003eMeshIdentity\u003c/code\u003e uses a SPIFFE template that does not reference the workload label.\u003c/li\u003e\u003cli\u003eEvery dataplane whose identity derives from the workload label already uses a workload-bound token.\u003c/li\u003e\u003c/ul\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb\", \"shortName\": \"Kong\", \"dateUpdated\": \"2026-08-12T18:47:06.710Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-18677\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-13T14:49:27.614Z\", \"dateReserved\": \"2026-08-03T15:20:45.630Z\", \"assignerOrgId\": \"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb\", \"datePublished\": \"2026-08-12T18:47:06.710Z\", \"assignerShortName\": \"Kong\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.