{"id":"CVE-2026-18675","aliases":["EUVD-2026-57421","GHSA-5mxq-7xq4-3vx8","GHSA-7gh2-244h-962w"],"status":"published","title":"Kong Mesh: control plane denial of service via a malformed dataplane token with a non-string JWT kid","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.\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.","severity":{"version":"4.0","score":5.3,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00561,"percentile":0.47104,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-248","CWE-704"],"published":"2026-08-12T18:36:17Z","modified":"2026-10-28T02:31:11Z","products":[{"vendor":"kong inc.","product":"kong mesh"}],"references":[{"url":"https://github.com/kumahq/kuma/security/advisories/GHSA-5mxq-7xq4-3vx8","tags":["vendor-advisory","advisory"]},{"url":"https://github.com/kumahq/kuma/pull/17465","tags":["patch","fix"]},{"url":"https://github.com/kumahq/kuma/pull/17468","tags":["patch","fix"]},{"url":"https://github.com/kumahq/kuma/pull/17467","tags":["patch","fix"]},{"url":"https://github.com/kumahq/kuma/pull/17471","tags":["patch","fix"]},{"url":"https://github.com/kumahq/kuma/pull/17469","tags":["patch","fix"]},{"url":"https://github.com/kumahq/kuma/pull/17470","tags":["patch","fix"]},{"url":"https://github.com/kumahq/kuma/pull/17472","tags":["patch","fix"]},{"url":"https://developer.konghq.com/mesh/changelog/","tags":["release-notes","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18675","tags":["advisory"]},{"url":"https://developer.konghq.com/mesh/changelog"},{"url":"https://github.com/advisories/GHSA-7gh2-244h-962w"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18675.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-18675","title":"Kong Mesh: control plane denial of service via a malformed dataplane token with a non-string JWT kid","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.\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.","status":"published","published":"2026-08-12T18:36:17.377Z","modified":"2026-08-13T15:28:44.341Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium","assessor":"cna"}],"cwes":["CWE-248","CWE-704"],"updated_at":"2026-11-02T14:20:12.60856Z"}],"euvd":[{"id":"EUVD-2026-57421","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.\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.","status":"published","published":"2026-08-12T18:36:17Z","modified":"2026-08-13T15:28:44Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T18:01:56.066325Z"}],"ghsa":[{"id":"GHSA-7gh2-244h-962w","title":"The dataplane token validator in kuma-cp performs an unchecked Go type assertion on the JWT kid...","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.\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.","status":"published","published":"2026-08-12T21:31:37Z","modified":"2026-08-12T21:31:37Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"cwes":["CWE-248"],"updated_at":"2026-11-02T15:10:23.958572Z"}],"nvd":[{"id":"CVE-2026-18675","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.\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.","status":"published","published":"2026-08-12T19:17:30.65Z","modified":"2026-10-23T19:10:00.167Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium","assessor":"secondary"}],"cwes":["CWE-248","CWE-704"],"updated_at":"2026-11-02T14:12:37.217486Z"}],"osv":[{"id":"CVE-2026-18675","title":"Kong Mesh: control plane denial of service via a malformed dataplane token with a non-string JWT kid","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.\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.","status":"published","published":"2026-08-12T18:36:17.377Z","modified":"2026-10-28T02:31:11.41872424Z","cvss":[{"version":"4.0","score":5.3,"vector":"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","level":"medium"}],"cwes":["CWE-248","CWE-704"],"updated_at":"2026-11-02T15:44:58.024074Z"}]}}