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CVE-2026-118678— n8n before 2.41.4 and 2.42.1 Prototype Pollution DoS via Workflow History Compaction

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 2.41.4 之前以及 2.42.x 系列中 2.42.1 之前的版本存在原型污染漏洞。该漏洞允许低权限用户通过保存带有特殊命名连接键的工作流，篡改内置对象的行为。攻击者可以在工作流连接中添加诸如 的键，这些键会被定期历史压缩任务处理，从而导致登录和写入操作因服务器错误而失败。

CVSS 7.1 · High

Affected Version Matrix 4

VendorProduct Version RangeStatus
n8n-io n8n < 2.41.4 affected
2.41.4 unaffected
2.42.0< 2.42.1 affected
2.42.1 unaffected
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I. Basic Information for CVE-2026-118678

Vulnerability Information
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Vulnerability Title
n8n before 2.41.4 and 2.42.1 Prototype Pollution DoS via Workflow History Compaction
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability that allows low-privileged users to alter built-in object behaviour by saving workflows with specially named connection keys. Attackers can add keys such as __proto__ to workflow connections, which the periodic history compaction task processes, causing logins and writes to fail with server errors.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
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 ~ 2.41.4 -
n8n-io n8n 2.42.0 ~ 2.42.1 -

II. Public POCs for CVE-2026-118678

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III. Intelligence Information for CVE-2026-118678

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Vendor Advisories for CVE-2026-118678 (2)

Same Patch Batch · n8n-io · 2026-10-28 · 15 CVEs total

CVE-2026-118645 8.7 HIGH n8n before 1.123.85, 2.43.5, and 2.44.1 Filter Injection via Quick Base Node Where Paramet
CVE-2026-118649 8.3 HIGH n8n before 2.43.5 and 2.44.1 Authorization Bypass via Crafted Workflow ID in Data Tables
CVE-2026-118647 8.2 HIGH n8n before 1.123.85, 2.43.5, and 2.44.1 SeaTable Trigger API Token Exposure via Execution
CVE-2026-118643 8.2 HIGH n8n before 1.123.85, 2.43.5, and 2.44.1 Credential Exposure via Node Execution Error Data
CVE-2026-118644 7.7 HIGH n8n before 2.41.5 and 2.42.2 Credential Theft via Error-Workflow Context Inheritance
CVE-2026-118679 7.5 HIGH n8n before 1.123.83, 2.41.4, and 2.42.1 Slack Token Exfiltration via Slack Trigger
CVE-2026-118641 7.5 HIGH n8n before 1.123.85, 2.43.5, and 2.44.1 OData $filter Injection via Outlook and SharePoint
CVE-2026-118648 7.3 HIGH n8n before 1.123.85, 2.43.5, and 2.44.1 Stored XSS via Webhook Responses Missing Sandbox P
CVE-2026-118675 7.1 HIGH n8n before 1.123.85, 2.43.5, and 2.44.1 Credential Guard Bypass via Execute Sub-workflow
CVE-2026-118676 7.1 HIGH n8n before 1.123.85, 2.43.5, and 2.44.1 Credential Permission Check Bypass
CVE-2026-118642 7.1 HIGH n8n before 1.123.85, 2.43.5, and 2.44.1 Credential Permission Check Bypass via Inline Sub-
CVE-2026-118646 6.5 MEDIUM n8n before 1.123.85, 2.43.5, and 2.44.1 ReDoS via Read/Write Files Node
CVE-2026-118677 5.9 MEDIUM n8n before 2.41.4 and 2.42.1 Local Gateway Deep-Link Silent Re-pairing to Attacker Instanc
CVE-2026-118640 5.4 MEDIUM n8n before 1.123.85, 2.43.5, and 2.44.1 Chat Hub Authorization Bypass

IV. Related Vulnerabilities

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