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 是一个开源的工作流自动化平台。在 1.123.76、2.37.7 和 2.38.2 之前，Git 节点的克隆操作会将攻击者可控的目标路径与默认的 N8N_BLOCK_FILE_PATTERNS 正则表达式进行匹配。正则表达式 允许发生灾难性回溯（catastrophic backtracking），并且在 n8n 主进程中同步执行。因此，经过认证的 workflow 编辑器可以通过一次工作流执行使实例冻结；受影响的默认配置在 中声明。该问题已在 1.123.76、2.37.7 和 2.38.2 版本中修复。
Possible ATT&CK Techniques 2 AI
T1027 · Obfuscated Files or Information T1059 · Command and Scripting Interpreter
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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
Affected Products
II. Public POCs for CVE-2026-86081
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-86081 (1)
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🔗 Release n8n@2.38.2 · n8n-io/n8n · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-86081 (1)
Vendor Pages for CVE-2026-86081 (2)
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🔗 Release n8n@2.37.7 · n8n-io/n8n · GitHub x_refsource_MISC
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🔗 Release n8n@1.123.76 · n8n-io/n8n · GitHub x_refsource_MISC
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
-
CVE-2026-86075
n8n: Unauthenticated Persistent Storage Exhaustion via OAuth -
CVE-2026-86076
n8n: Expression Sandbox Escape in Editor-UI Enables Stored C -
CVE-2026-86077
n8n: Anonymous Approval-Gate Bypass via Reused resumeToken o -
CVE-2026-86078
n8n: Prototype Pollution via Workflow Structure Summary Can -
CVE-2026-86079
n8n: Path Injection in Elasticsearch and ElasticSecurity Nod
Same vendor: n8n-io
-
CVE-2026-86075
n8n: Unauthenticated Persistent Storage Exhaustion via OAuth -
CVE-2026-86076
n8n: Expression Sandbox Escape in Editor-UI Enables Stored C -
CVE-2026-86077
n8n: Anonymous Approval-Gate Bypass via Reused resumeToken o -
CVE-2026-86078
n8n: Prototype Pollution via Workflow Structure Summary Can -
CVE-2026-86079
n8n: Path Injection in Elasticsearch and ElasticSecurity Nod
Same weakness: CWE-1333
-
CVE-2026-85062
Colord: Slow rejection of oversized malformed color strings -
CVE-2024-58379
nodemailer before 6.9.9 ReDoS via attachDataUrls parameter -
CVE-2026-80206
NLTK 3.10.2 Regular Expression Denial of Service via tgrep -
CVE-2026-80205
NLTK before 3.10.0 ReDoS via Text.findall() unvalidated rege -
CVE-2026-79770
Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer
V. Comments for CVE-2026-86081
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