SEPTEMBER 19, 2026
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Case File

CVE-2026-63462

HIGH · CVSS 7.5 EPSS 0.48% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-21 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

Unleash's open-source feature management platform is vulnerable to a denial-of-service attack due to improper handling of deeply nested JSON input in its OpenAPI validation error path. An unauthenticated attacker can exploit this flaw by sending a specially crafted request, leading to a RangeError that crashes the Node process and results in service outages. Organizations using affected versions should prioritize upgrading to versions 7.5.2, 7.6.5, or 8.0.2 to mitigate this high-severity vulnerability.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

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CVE
CVE-2026-63462
Severity
HIGH
CVSS
7.5
EPSS
0.48%

Original NVD 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.