Uncontrolled Recursion Affecting unleash-server package, versions <8.0.2-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-UNLEASHSERVER-19232310
- published23 Aug 2026
- disclosed21 Aug 2026
Introduced: 21 Aug 2026
NewCVE-2026-63462 (opens in a new tab)How to fix?
Upgrade Minimos:latest unleash-server to version 8.0.2-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream unleash-server package and not the unleash-server package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
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.
References
- https://www.cve.org/CVERecord?id=CVE-2026-63462
- https://github.com/advisories/GHSA-r5pq-6chh-j3xp
- https://osv.dev/vulnerability/MINI-j4pp-98gg-q48h
- https://osv.dev/vulnerability/CVE-2026-63462
- 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
- https://github.com/Unleash/unleash/security/advisories/GHSA-r5pq-6chh-j3xp