CVE-2026-18675
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.
Does this matter?
Lower severity and a low EPSS score (0.38%). Track it; it rarely justifies an emergency change on its own.
Description
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 4.0
- 5.3 MEDIUMCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.38% probability · 32th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-248, CWE-704
- Source
- 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.