CVEvulnerability
CVE-2026-18675
5.3 MEDIUM
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-08-12
- Last modified
- 2026-10-23
- Assigner
- 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb
- CVSS 4.0 (02762ae7-200e-4b20-9b2b-a77d5b8fc4cb)
- 5.3 MEDIUM — CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Weaknesses
- CWE-248, CWE-704
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.
Related
References
- https://developer.konghq.com/mesh/changelog/ developer.konghq.com
- https://github.com/kumahq/kuma/pull/17465 github.com
- https://github.com/kumahq/kuma/pull/17467 github.com
- https://github.com/kumahq/kuma/pull/17468 github.com
- https://github.com/kumahq/kuma/pull/17469 github.com
- https://github.com/kumahq/kuma/pull/17470 github.com
- https://github.com/kumahq/kuma/pull/17471 github.com
- https://github.com/kumahq/kuma/pull/17472 github.com
- https://github.com/kumahq/kuma/security/advisories/GHSA-5mxq-7xq4-3vx8 github.com