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

No history.

Information

Published : 2026-08-12 19:17

Updated : 2026-08-31 19:22

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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