Vulnerability in Unleash

CVE-2026-63462

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.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

  • Unleash — versions < 7.5.2, >= 7.6.0, < 7.6.5, >= 8.0.0, < 8.0.2

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-63462?
CVE-2026-63462 is a high-severity vulnerability in Unleash, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-08-21.
How severe is CVE-2026-63462?
High severity. CVSS v3 base score is 7.5 out of 10.