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CVE-2026-110848— n8n before 1.123.83, 2.41.4, and 2.42.1 Prototype Pollution via AI Workflow Builder Connection Merge

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 在版本 1.123.83 之前、2.x 在版本 2.41.4 之前，以及 2.42.x 在版本 2.42.1 之前，存在一个原型污染漏洞，该漏洞出现在 AI 工作流构建器中。此漏洞在合并工作流连接时，使用节点名称作为对象成员，但未检查保留键。经过身份验证的用户可以通过 API 创建名为 __proto__ 的节点，并调用 connect-nodes 操作来污染全局对象原型，从而导致实例在重启前无法正常运作。

CVSS 6.0 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-110848

Vulnerability Information
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Vulnerability Title
n8n before 1.123.83, 2.41.4, and 2.42.1 Prototype Pollution via AI Workflow Builder Connection Merge
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1 contains a prototype pollution vulnerability in the AI workflow builder, which merges workflow connections using node names as object members without checking for reserved keys. Authenticated users can create nodes named __proto__ through the API and invoke the connect-nodes operation to pollute the global object prototype, disrupting the instance until restart.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
n8n-io n8n 0 ~ 1.123.83 -

II. Public POCs for CVE-2026-110848

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III. Intelligence Information for CVE-2026-110848

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Other References for CVE-2026-110848 (2)

Same Patch Batch · n8n-io · 2026-10-14 · 14 CVEs total

CVE-2026-110843 8.2 HIGH n8n before 2.41.4 and 2.42.1 Unauthenticated Unbounded OAuth Client Persistence via Author
CVE-2026-110842 7.7 HIGH n8n before 2.41.4 and 2.42.1 Prototype Pollution via MCP Workflow-Validation Interpreter
CVE-2026-110845 7.7 HIGH n8n before 1.123.83, 2.41.4, and 2.42.1 Code Execution via Git Node Log Operation
CVE-2026-110850 7.2 HIGH n8n before 2.41.4 and 2.42.1 Credential Check Bypass via Agent Node Parameters
CVE-2026-110844 7.2 HIGH n8n before 1.123.83 Credential Authorization Bypass via Nested Inline Sub-Workflows
CVE-2026-110849 7.2 HIGH n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Binary-Data File Preview
CVE-2026-110853 7.1 HIGH n8n before 1.123.83 Authorization Bypass via Execute Sub-workflow Inline JSON
CVE-2026-110846 7.0 HIGH n8n before 2.41.4 and 2.42.1 Send-and-Wait HMAC Signature Bypass via Waiting-Webhook
CVE-2026-110847 7.0 HIGH n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Chat Trigger customCss Parameter
CVE-2026-110840 7.0 HIGH n8n before 2.41.4 and 2.42.1 SQL Injection via Microsoft SQL Node Query Field
CVE-2026-110852 6.3 MEDIUM n8n before 1.123.83, 2.41.4, and 2.42.1 Unauthenticated Workflow Execution via Dynamic-Pat
CVE-2026-110851 6.1 MEDIUM n8n before 2.41.4 and 2.42.1 Cross-Project Agent Ownership Transfer via Agents Create Endp
CVE-2026-110841 6.1 MEDIUM n8n before 2.41.4 and 2.42.0 Authorization Bypass in Agent Chat Resume Tool Approval

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-110848

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