{"id":"CVE-2026-63462","state":"PUBLISHED","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.","publishedAt":"2026-08-21T18:12:32.807Z","updatedAt":"2026-08-25T17:33:23.689Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["Unleash unleash"],"affected":[{"vendor":"Unleash","product":"unleash","versions":[{"version":"< 7.5.2","status":"affected"},{"version":">= 7.6.0, < 7.6.5","status":"affected"},{"version":">= 8.0.0, < 8.0.2","status":"affected"}]}],"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"],"weaknesses":["CWE-674"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63462.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63462","state":"PUBLISHED","datePublished":"2026-08-21T18:12:32.807Z","dateUpdated":"2026-08-25T17:33:23.689Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-16T21:37:45.768Z"},"containers":{"cna":{"title":"Unleash: Unauthenticated single-request DoS via OpenAPI validation error formatter","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Unleash","product":"unleash","versions":[{"version":"< 7.5.2","status":"affected"},{"version":">= 7.6.0, < 7.6.5","status":"affected"},{"version":">= 8.0.0, < 8.0.2","status":"affected"}]}],"references":[{"url":"https://github.com/Unleash/unleash/security/advisories/GHSA-r5pq-6chh-j3xp","name":"https://github.com/Unleash/unleash/security/advisories/GHSA-r5pq-6chh-j3xp","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/Unleash/unleash/commit/b0e4da63249a9403bc209e0581db223326cb8dcf","name":"https://github.com/Unleash/unleash/commit/b0e4da63249a9403bc209e0581db223326cb8dcf","tags":["x_refsource_MISC"]},{"url":"https://github.com/Unleash/unleash/commit/d45f99df924c0d24747b3e45e46fcda7dcd3c1c1","name":"https://github.com/Unleash/unleash/commit/d45f99df924c0d24747b3e45e46fcda7dcd3c1c1","tags":["x_refsource_MISC"]},{"url":"https://github.com/Unleash/unleash/commit/d862562a5ab8f2d1e40f6519c64cf0b4fdaf806d","name":"https://github.com/Unleash/unleash/commit/d862562a5ab8f2d1e40f6519c64cf0b4fdaf806d","tags":["x_refsource_MISC"]},{"url":"https://github.com/Unleash/unleash/releases/tag/v7.5.2","name":"https://github.com/Unleash/unleash/releases/tag/v7.5.2","tags":["x_refsource_MISC"]},{"url":"https://github.com/Unleash/unleash/releases/tag/v7.6.5","name":"https://github.com/Unleash/unleash/releases/tag/v7.6.5","tags":["x_refsource_MISC"]},{"url":"https://github.com/Unleash/unleash/releases/tag/v8.0.2","name":"https://github.com/Unleash/unleash/releases/tag/v8.0.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-674","lang":"en","description":"CWE-674: Uncontrolled Recursion","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-21T18:12:32.807Z"},"source":{"advisory":"GHSA-r5pq-6chh-j3xp","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/Unleash/unleash/security/advisories/GHSA-r5pq-6chh-j3xp","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T17:32:06.100866Z","id":"CVE-2026-63462","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-25T17:33:23.689Z"}}]}}}