CVE-2026-77082

Medium

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.

SeverityMedium

CVSS4.3

Exploit probability—

Product

N8n

PublishedAug 20, 2026

First seenAug 20, 2026

Weakness typeCWE-1333CWE-1333

How to fix

Update

n8n n8n1.123.69, 2.33.4 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-q3fv-295f-qfpf

Affected products

Product	Affected versions	Fixed in
n8n n8n	v < 1.123.69, 2.0.0 ≤ v < 2.33.4, 2.34.0	1.123.69, 2.33.4

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