CVE-2026-18675

The dataplane token validator in kuma-cp performs an unchecked Go type assertion on the JWT kid header. A token whose kid is a JSON number decodes as a float64 and triggers a runtime panic before any signature, claims, or authorization check runs. The panic terminates the entire kuma-cp process, HTTP API, the health and readiness endpoints, and xDS. Unauthenticated access to the dataplane gRPC server can trigger the crash with a malformed token A single request is a transient interruption; sustaining an outage requires repeated requests.

CVSS

No CVSS.

References

Link	Resource
https://developer.konghq.com/mesh/changelog/
https://github.com/kumahq/kuma/pull/17465
https://github.com/kumahq/kuma/pull/17467
https://github.com/kumahq/kuma/pull/17468
https://github.com/kumahq/kuma/pull/17469
https://github.com/kumahq/kuma/pull/17470
https://github.com/kumahq/kuma/pull/17471
https://github.com/kumahq/kuma/pull/17472
https://github.com/kumahq/kuma/security/advisories/GHSA-5mxq-7xq4-3vx8

Configurations

No configuration.

History

23 Oct 2026, 19:10

Type	Values Removed	Values Added
Summary		(es) El validador de tokens del plano de datos en kuma-cp realiza una aserción de tipo Go sin verificar en el encabezado ’kid’ de JWT. Un token cuyo ’kid’ es un número JSON se decodifica como un float64 y desencadena un pánico en tiempo de ejecución antes de que se ejecute cualquier verificación de firma, reclamaciones o autorización. El pánico termina todo el proceso de kuma-cp, la API HTTP, los puntos finales de salud y disponibilidad, y xDS. El acceso no autenticado al servidor gRPC del plano de datos puede desencadenar el fallo con un token malformado. Una única solicitud es una interrupción transitoria; mantener una interrupción del servicio requiere solicitudes repetidas.

Information

Published : 2026-08-12 19:17

Updated : 2026-10-23 19:10

NVD link : CVE-2026-18675

Mitre link : CVE-2026-18675

CVE.ORG link : CVE-2026-18675

JSON object : View

Products Affected

No product.

CWE

CWE-248

Uncaught Exception

CWE-704

Incorrect Type Conversion or Cast

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A token whose kid is a JSON number decodes as a float64 and triggers a runtime panic before any signature, claims, or authorization check runs.\n\n\n\nThe panic terminates the entire kuma-cp process, HTTP API, the health and readiness endpoints, and xDS. Unauthenticated access to the dataplane gRPC server can trigger the crash with a malformed token\n\n\n\nA single request is a transient interruption; sustaining an outage requires repeated requests."}, {"lang": "es", "value": "El validador de tokens del plano de datos en kuma-cp realiza una aserci\u00f3n de tipo Go sin verificar en el encabezado \u2019kid\u2019 de JWT. Un token cuyo \u2019kid\u2019 es un n\u00famero JSON se decodifica como un float64 y desencadena un p\u00e1nico en tiempo de ejecuci\u00f3n antes de que se ejecute cualquier verificaci\u00f3n de firma, reclamaciones o autorizaci\u00f3n.\n\nEl p\u00e1nico termina todo el proceso de kuma-cp, la API HTTP, los puntos finales de salud y disponibilidad, y xDS. El acceso no autenticado al servidor gRPC del plano de datos puede desencadenar el fallo con un token malformado.\n\nUna \u00fanica solicitud es una interrupci\u00f3n transitoria; mantener una interrupci\u00f3n del servicio requiere solicitudes repetidas."}], "lastModified": "2026-10-23T19:10:00.167", "sourceIdentifier": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"}