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

CVSS 5.3 · Medium EPSS 0.29% · P21

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 6

VendorProductVersion RangeStatus
n8n-ion8n< 1.123.69affected
1.123.69unaffected
2.34.0< 2.34.1affected
2.34.1unaffected
2.0.0< 2.33.4affected
2.33.4unaffected
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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

VendorProductAffected VersionsCPESubscribe
n8n-ion8n 0 ~ 1.123.69 -
n8n-ion8n 2.34.0 ~ 2.34.1 -
n8n-ion8n 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-2026-770808.7 HIGHn8n before 1.123.69 Arbitrary File Read and Write via Snowflake
CVE-2026-770688.7 HIGHn8n before 2.34.1 Remote Code Execution via Path Traversal
CVE-2026-770758.4 HIGHn8n before 1.123.69 Expression Injection via Resource Locator
CVE-2026-770728.4 HIGHn8n before 1.123.69 Stored XSS via Form Completion Page
CVE-2026-770847.7 HIGHn8n before 1.123.69 Remote Code Execution via Git Node Configuration Values
CVE-2026-770797.4 HIGHn8n before 2.34.1 Authorization Bypass via Custom Role Deletion
CVE-2026-770777.2 HIGHn8n before 1.123.69 Remote Code Execution via EventEmitter Prototype Pollution
CVE-2026-770717.1 HIGHn8n before 1.123.69 PostgREST Filter Injection via Supabase
CVE-2026-770767.1 HIGHn8n before 1.123.69 Credential Leak via GraphQL Node Error
CVE-2026-770707.1 HIGHn8n before 1.123.69 NoSQL Injection via MongoDB Node
CVE-2026-770856.3 MEDIUMn8n before 2.34.1 SSRF Protection Bypass via SearXNG Tool
CVE-2026-770836.0 MEDIUMn8n before 1.123.69 Code Node Sandbox Escape via Function.prototype Pollution
CVE-2026-770746.0 MEDIUMn8n before 1.123.69 SSRF via Edit Image Node
CVE-2026-770735.3 MEDIUMn8n before 2.34.1 Cross-Project Credential Access via MCP
CVE-2026-770815.1 MEDIUMn8n before 1.123.69 Allowed-Domains Bypass via GraphQL Node
CVE-2026-770692.3 LOWn8n 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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