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CVE-2026-86078— n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service

Quick assessment

Affected
n8n-io n8n
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

n8n是n8n公司开源的一款支持持续集成与交付的工作流自动化工具。 n8n 2.37.7之前版本和2.38.0至2.38.2之前版本存在输入验证错误漏洞，该漏洞源于Instance AI工作流摘要功能将存储工作流中的节点名称和连接键作为普通对象键使用，且未有效过滤特殊键名，导致通过REST API提交的恶意工作流可借助__proto__或constructor污染Object.prototype，从而干扰后续请求。

CVSS 6.0 · Medium EPSS 0.59% · P47

Affected Version Matrix 2

VendorProduct Version RangeStatus
n8n-io n8n < 2.37.7 affected
>= 2.38.0, < 2.38.2 affected
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I. Basic Information for CVE-2026-86078

Vulnerability Information
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Vulnerability Title
n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the Instance AI workflow summary used node names and connection keys from stored workflows as ordinary object keys. A workflow submitted through the REST API could contain __proto__ or constructor, causing nested writes to reach Object.prototype in the main n8n process and disrupt later requests. The affected function is summarizeWorkflowStructure in packages/@n8n/instance-ai/src/tools/workflows/summarize-workflow.ts. This issue is fixed in versions 2.37.7 and 2.38.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n是n8n公司开源的一款支持持续集成与交付的工作流自动化工具。 n8n 2.37.7之前版本和2.38.0至2.38.2之前版本存在输入验证错误漏洞，该漏洞源于Instance AI工作流摘要功能将存储工作流中的节点名称和连接键作为普通对象键使用，且未有效过滤特殊键名，导致通过REST API提交的恶意工作流可借助__proto__或constructor污染Object.prototype，从而干扰后续请求。
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
n8n-io n8n < 2.37.7 -

II. Public POCs for CVE-2026-86078

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III. Intelligence Information for CVE-2026-86078

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Patches & Fixes for CVE-2026-86078 (1)

Vendor Advisories for CVE-2026-86078 (1)

Vendor Pages for CVE-2026-86078 (1)

Same Patch Batch · n8n-io · 2026-09-08 · 17 CVEs total

CVE-2026-86076 8.7 HIGH n8n: Expression Sandbox Escape in Editor-UI Enables Stored Cross-User JavaScript Execution
CVE-2026-86075 8.7 HIGH n8n: Unauthenticated Persistent Storage Exhaustion via OAuth Dynamic Client Registration E
CVE-2026-86083 7.7 HIGH n8n: Expression Sandbox Escape via Shared Builtin Tampering and Code-Printer Injection Lea
CVE-2026-86082 7.1 HIGH n8n: Domain-Restriction Bypass via Unguarded Model-Search Endpoint in OpenAI Chat Model No
CVE-2026-86081 7.1 HIGH n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a
CVE-2026-86077 6.3 MEDIUM n8n: Anonymous Approval-Gate Bypass via Reused resumeToken over the Chat WebSocket
CVE-2026-86080 6.3 MEDIUM n8n: GitHub Trigger 422 Reuse Path Skips Webhook Secret Storage, Causing Signature Verific
CVE-2026-86079 6.3 MEDIUM n8n: Path Injection in Elasticsearch and ElasticSecurity Nodes via Unencoded Identifiers
CVE-2026-86084 6.0 MEDIUM n8n: Disabled OIDC SSO Endpoints Remain Active and Issue Valid Sessions
CVE-2026-86073 5.9 MEDIUM n8n: Per-Resource OAuth Consent Bypass via Unbound Refresh Token Resource Substitution
CVE-2026-86074 5.9 MEDIUM n8n: Instance AI Credential Setup Accepts Unvalidated Probe URL from Fetched Content
CVE-2026-86993 5.9 MEDIUM n8n: Log Streaming Event Destinations Decrypt Generic-Auth Credentials Without Ownership C
CVE-2026-86994 5.3 MEDIUM n8n: Cross-User Active Workflow ID and Lifecycle Event Disclosure via Missing userId Filte
CVE-2026-86995 5.3 MEDIUM n8n: Git Node branch.<name>.remote Config Key Bypasses Sandbox Path Restriction, Enabling
CVE-2026-86996 5.3 MEDIUM n8n: Agent Workflow Tool Bypasses Sub-Workflow Caller Policy
CVE-2026-86085 5.1 MEDIUM n8n: Cross-Tenant Project-Member PII Disclosure via Missing Per-Project Scope Check on Rol

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-1321