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CVE-2026-86081— n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path

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 1.123.76之前版本、2.37.7之前版本和2.38.2之前版本存在资源管理错误漏洞，该漏洞源于Git节点克隆操作将攻击者控制的目标路径与默认N8N_BLOCK_FILE_PATTERNS正则表达式匹配，该正则表达式允许灾难性回溯，可能导致经过身份验证的工作流编辑器通过一次工作流执行冻结实例。

CVSS 7.1 · High EPSS 0.56% · P46

Affected Version Matrix 3

VendorProduct Version RangeStatus
n8n-io n8n >= 2.38.0, < 2.38.2 affected
>= 2.0.0, < 2.37.7 affected
< 1.123.76 affected
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I. Basic Information for CVE-2026-86081

Vulnerability Information
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Vulnerability Title
n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path
Source: CVE Program / CVE List V5
Vulnerability Description
n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the Git node clone operation matched an attacker-controlled destination path against the default N8N_BLOCK_FILE_PATTERNS regular expression. The pattern ^(./).git(/.)$ allowed catastrophic backtracking and ran synchronously in the main n8n process. An authenticated workflow editor could therefore freeze the instance with one workflow execution; the affected default is declared in packages/@n8n/config/src/configs/security.config.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/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-1333
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 资源管理错误漏洞
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 1.123.76之前版本、2.37.7之前版本和2.38.2之前版本存在资源管理错误漏洞，该漏洞源于Git节点克隆操作将攻击者控制的目标路径与默认N8N_BLOCK_FILE_PATTERNS正则表达式匹配，该正则表达式允许灾难性回溯，可能导致经过身份验证的工作流编辑器通过一次工作流执行冻结实例。
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 >= 2.38.0, < 2.38.2 -

II. Public POCs for CVE-2026-86081

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III. Intelligence Information for CVE-2026-86081

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Patches & Fixes for CVE-2026-86081 (1)

Vendor Advisories for CVE-2026-86081 (1)

Vendor Pages for CVE-2026-86081 (2)

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-2026-86077 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-2026-86078 6.0 MEDIUM n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service
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-1333

V. Comments for CVE-2026-86081

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