Unleash: Unauthenticated single-request DoS via OpenAPI validation error formatter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63462
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-21 19:17:31 UTC
Updated2026-08-21 19:17:31 UTC
DescriptionUnleash 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-674 | CWE-674 CWE-674: Uncontrolled Recursion

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Unleash Unleash affected < 7.5.2 Not specified
CNA Unleash Unleash affected >= 7.6.0, < 7.6.5 Not specified
CNA Unleash Unleash affected >= 8.0.0, < 8.0.2 Not specified

References

ReferenceSourceLinkTags
github.com/Unleash/unleash/security/advisories/GHSA-r5pq-6chh-j3xp [email protected] github.com
github.com/Unleash/unleash/commit/d45f99df924c0d24747b3e45e46fcda7dcd3c1c1 [email protected] github.com
github.com/Unleash/unleash/releases/tag/v7.6.5 [email protected] github.com
github.com/Unleash/unleash/commit/d862562a5ab8f2d1e40f6519c64cf0b4fdaf806d [email protected] github.com
github.com/Unleash/unleash/releases/tag/v7.5.2 [email protected] github.com
github.com/Unleash/unleash/commit/b0e4da63249a9403bc209e0581db223326cb8dcf [email protected] github.com
github.com/Unleash/unleash/releases/tag/v8.0.2 [email protected] github.com
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