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CVE-2026-77082— n8n before 1.123.69 ReDoS via Filter and Switch Node

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.

在 n8n 1.123.69 之前的版本、2.x 版本中 2.33.4 之前的版本，以及 2.34.x 版本中 2.34.1 之前的版本中，“Filter”（过滤器）和“Switch”（切换）节点存在正则表达式拒绝服务（ReDoS）漏洞。这些节点使用 编译用户提供的正则表达式，并在工作线程上同步执行，且未进行复杂度验证或设置执行超时限制。通过构造恶意正则表达式，可能导致处理每条数据项时工作线程被长时间阻塞，从而延迟在同一工作线程上运行的其他工作流的执行。

CVSS 5.3 · Medium EPSS 0.29% · P21

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 6

VendorProduct Version RangeStatus
n8n-io n8n < 1.123.69 affected
1.123.69 unaffected
2.34.0< 2.34.1 affected
2.34.1 unaffected
2.0.0< 2.33.4 affected
2.33.4 unaffected
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I. Basic Information for CVE-2026-77082

Vulnerability Information
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Vulnerability Title
n8n before 1.123.69 ReDoS via Filter and Switch Node
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 1.123.69, 2.x before 2.33.4, and 2.34.x before 2.34.1 contains a regular expression denial of service (ReDoS) vulnerability in the Filter and Switch nodes, which compile user-supplied regex patterns with new RegExp() and execute them synchronously on the worker thread without complexity validation or execution timeout. A crafted regex pattern can block the worker for an extended period per data item processed, delaying other workflow executions on the same worker.
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:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
n8n-io n8n 0 ~ 1.123.69 -
n8n-io n8n 2.34.0 ~ 2.34.1 -
n8n-io n8n 2.0.0 ~ 2.33.4 -

II. Public POCs for CVE-2026-77082

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III. Intelligence Information for CVE-2026-77082

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Vendor Advisories for CVE-2026-77082 (2)

Same Patch Batch · n8n-io · 2026-08-20 · 17 CVEs total

CVE-2026-77080 8.7 HIGH n8n before 1.123.69 Arbitrary File Read and Write via Snowflake
CVE-2026-77068 8.7 HIGH n8n before 2.34.1 Remote Code Execution via Path Traversal
CVE-2026-77075 8.4 HIGH n8n before 1.123.69 Expression Injection via Resource Locator
CVE-2026-77072 8.4 HIGH n8n before 1.123.69 Stored XSS via Form Completion Page
CVE-2026-77084 7.7 HIGH n8n before 1.123.69 Remote Code Execution via Git Node Configuration Values
CVE-2026-77079 7.4 HIGH n8n before 2.34.1 Authorization Bypass via Custom Role Deletion
CVE-2026-77077 7.2 HIGH n8n before 1.123.69 Remote Code Execution via EventEmitter Prototype Pollution
CVE-2026-77071 7.1 HIGH n8n before 1.123.69 PostgREST Filter Injection via Supabase
CVE-2026-77076 7.1 HIGH n8n before 1.123.69 Credential Leak via GraphQL Node Error
CVE-2026-77070 7.1 HIGH n8n before 1.123.69 NoSQL Injection via MongoDB Node
CVE-2026-77085 6.3 MEDIUM n8n before 2.34.1 SSRF Protection Bypass via SearXNG Tool
CVE-2026-77083 6.0 MEDIUM n8n before 1.123.69 Code Node Sandbox Escape via Function.prototype Pollution
CVE-2026-77074 6.0 MEDIUM n8n before 1.123.69 SSRF via Edit Image Node
CVE-2026-77073 5.3 MEDIUM n8n before 2.34.1 Cross-Project Credential Access via MCP
CVE-2026-77081 5.1 MEDIUM n8n before 1.123.69 Allowed-Domains Bypass via GraphQL Node
CVE-2026-77069 2.3 LOW n8n before 1.123.69 SSRF Protection Bypass via OAuth2

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-1333

V. Comments for CVE-2026-77082

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