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Advisories

n8n before 1.123.69 ReDoS via Filter and Switch Node

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severity
medium
date
Affecting

  • n8n >= 0, < 1.123.69

  • n8n >= 0, < 2.34.1

  • n8n >= 0, < 2.33.4

CWE
  • CWE-1333 Inefficient Regular Expression Complexity
CVSS
5.3
CVSS V4 Vector
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
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.

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