CVE-2026-18675
mediumpriority · track · 0EPSS 0.006 · 46 %ileEUEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.3–5.3
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (6)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (28)
External citations — patches, advisories, analysis.
- https://developer.konghq.com/mesh/changelog/cnnvd
- https://github.com/kumahq/kuma/pull/17465cnnvd
- https://github.com/kumahq/kuma/pull/17467cnnvd
- https://github.com/kumahq/kuma/pull/17468cnnvd
- https://github.com/kumahq/kuma/pull/17469cnnvd
- https://github.com/kumahq/kuma/pull/17470cnnvd
- https://github.com/kumahq/kuma/pull/17471cnnvd
- https://github.com/kumahq/kuma/pull/17472cnnvd
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