---
cve: "CVE-2026-63462"
severity: "HIGH"
cvss: 7.5
epss: "0.5%"
vendor: "Unleash"
kev: false
exploited: false
published: "2026-08-21 19:17:31"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T07:12:26+02:00"
---

# CVE-2026-63462

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- b4d1bf8917a8059ffb9eb32f11af6bc1473a7782 (Commit)
- b501005d1d9961605e9c7b5333d17c8ca14579f1 (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-63462) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_