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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 是一个开源的功能管理（Feature Management）平台。在版本 7.5.2、7.6.5 和 8.0.2 之前，位于 中的共享 OpenAPI 验证错误处理路径存在安全漏洞。该路径在 和 函数中，会将通过 获取的原始请求值直接传递给 ，且未对调用栈深度进行限制，从而导致栈溢出风险。 未经验证的攻击者可以向 、 或其他经过 OpenAPI 验证的端点发送 POST 请求，并在请求体中嵌入一个嵌套深度达数千层的约 10 KB JSON 数据。这将导致 中出现 （最大调用栈大小超出范围）错误，并导

CVSS 7.5 · High EPSS 0.38% · P31

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

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

V. Comments for CVE-2026-63462

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