CVE-2026-77082

n8n before 1.123.69 ReDoS via Filter and Switch Node

State: Published
Severity: 5.3 Medium
Published: Aug 20, 2026
Updated: Aug 21, 2026
Reserved: Aug 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	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	VulnCheck

Weaknesses

CWE-1333 Inefficient Regular Expression Complexity

Affected Products

Product	Versions
n8nn8n-io	before 1.123.69Affected 1.123.69Not affected
n8nn8n-io	2.34.0 to before 2.34.1Affected 2.34.1Not affected
n8nn8n-io	2.0.0 to before 2.33.4Affected 2.33.4Not affected

References

GitHub Security Advisory (GHSA-q3fv-295f-qfpf)vendor-advisory
VulnCheck Advisory: n8n before 1.123.69 ReDoS via Filter and Switch Nodethird-party-advisory

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