{"id":"CVE-2026-63462","revision":"aef74c45fab04af09c03190215802136","records":[{"revision":"aef74c45fab04af09c03190215802136","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63462","aliases":[],"title":"Unleash: Unauthenticated single-request DoS via OpenAPI validation error formatter","description":"Unleash is an open-source feature management platform. Prior to 7.5.2, 7.6.5, and 8.0.2, the shared OpenAPI validation error path in src/lib/error/bad-data-error.ts passes a raw request value from lodash.get to JSON.stringify in genericErrorMessage and fromOpenApiValidationErrors without guarding stack exhaustion. An unauthenticated attacker can send a roughly 10 KB JSON value nested thousands of levels deep to POST /edge/validate, POST /edge/issue-token, or another OpenAPI-validated endpoint, causing RangeError: Maximum call stack size exceeded in openAPIValidationMiddleware and terminating the Node process because no uncaughtException handler recovers it. Replaying the request can sustain a complete service outage. This issue is fixed in versions 7.5.2, 7.6.5, and 8.0.2.","state":0,"publishedAt":"2026-08-21T18:12:32.807+00:00","modifiedAt":"2026-08-25T17:33:23.689+00:00","affected":[{"ecosystem":"Vendor product","name":"unleash","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Unleash\",\n                    \"product\": \"unleash\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 7.5.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 7.6.0, < 7.6.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 8.0.0, < 8.0.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/Unleash/unleash/security/advisories/GHSA-r5pq-6chh-j3xp","https://github.com/Unleash/unleash/commit/b0e4da63249a9403bc209e0581db223326cb8dcf","https://github.com/Unleash/unleash/commit/d45f99df924c0d24747b3e45e46fcda7dcd3c1c1","https://github.com/Unleash/unleash/commit/d862562a5ab8f2d1e40f6519c64cf0b4fdaf806d","https://github.com/Unleash/unleash/releases/tag/v7.5.2","https://github.com/Unleash/unleash/releases/tag/v7.6.5","https://github.com/Unleash/unleash/releases/tag/v8.0.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63462","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63462","identifiers":["CVE-2026-63462"]},"retained":false,"historicalAffected":[]}],"coverage":[]}