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CVE-2026-63462

7.5 · HIGH

Unleash is an open-source feature management platform.

Published Aug 21, 2026CWE-674EPSS 0.70%

Overview

CVE-2026-63462 is a high-severity vulnerability. It was published on August 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/Unleash/unleash/commit/b0e4da63249a9403bc209e0581db223326cb8dcfGitHubgithub.com/Unleash/unleash/commit/d45f99df924c0d24747b3e45e46fcda7dcd3c1c1GitHubgithub.com/Unleash/unleash/commit/d862562a5ab8f2d1e40f6519c64cf0b4fdaf806dGitHubgithub.com/Unleash/unleash/releases/tag/v7.5.2GitHubgithub.com/Unleash/unleash/releases/tag/v7.6.5GitHubgithub.com/Unleash/unleash/releases/tag/v8.0.2GitHubgithub.com/Unleash/unleash/security/advisories/GHSA-r5pq-6chh-j3xpGitHubgithub.com/Unleash/unleash/security/advisories/GHSA-r5pq-6chh-j3xp

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63462?

CVE-2026-63462 is a high-severity vulnerability. It was published on August 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-63462?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-63462?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-63462?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63462 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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