CVE-2026-77082: n8n

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• n8n n8n: before 1.123.69 (fixed in 1.123.69); from 2.0.0, before 2.33.4 (fixed in 2.33.4); version 2.34.0 only

Published 2026-08-20. Last modified 2026-09-01.