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CVE-2026-63462— Unleash: Unauthenticated single-request DoS via OpenAPI validation error formatter

Quick assessment

Affected
Unleash unleash
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Unleash是Unleash组织的一款功能管理平台。 Unleash 7.5.2之前版本、7.6.5之前版本和8.0.2之前版本存在资源管理错误漏洞，该漏洞源于src/lib/error/bad-data-error.ts中OpenAPI验证错误路径未对lodash.get获取的原始请求值进行堆栈耗尽防护，可能导致未经身份验证的攻击者向/edge/validate等端点发送深层嵌套的JSON请求，触发栈溢出错误并使Node进程终止，造成拒绝服务。

CVSS 7.5 · High EPSS 0.70% · P53

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 3

VendorProduct Version RangeStatus
Unleash unleash < 7.5.2 affected
>= 7.6.0, < 7.6.5 affected
>= 8.0.0, < 8.0.2 affected
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I. Basic Information for CVE-2026-63462

Vulnerability Information
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Vulnerability Title
Unleash: Unauthenticated single-request DoS via OpenAPI validation error formatter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Unleash 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Unleash是Unleash组织的一款功能管理平台。 Unleash 7.5.2之前版本、7.6.5之前版本和8.0.2之前版本存在资源管理错误漏洞，该漏洞源于src/lib/error/bad-data-error.ts中OpenAPI验证错误路径未对lodash.get获取的原始请求值进行堆栈耗尽防护，可能导致未经身份验证的攻击者向/edge/validate等端点发送深层嵌套的JSON请求，触发栈溢出错误并使Node进程终止，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unleash unleash < 7.5.2 -

II. Public POCs for CVE-2026-63462

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10481 chars
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III. Intelligence Information for CVE-2026-63462

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Patches & Fixes for CVE-2026-63462 (1)

Vendor Advisories for CVE-2026-63462 (1)

Vendor Pages for CVE-2026-63462 (3)

Same Patch Batch · Unleash · 2026-08-21 · 3 CVEs total

CVE-2026-63004 5.5 MEDIUM Unleash: Addon webhook URL is dialed server-side with no internal-address filtering, enabl
CVE-2026-63466 4.1 MEDIUM Unleash: Global Mustache.escape override disables HTML escaping process-wide, enabling Sla

IV. Related Vulnerabilities

Same product: unleash
Same vendor: Unleash
Same weakness: CWE-674