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CVE-2026-77082 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/n8n-io/n8n/security/advisories/GHSA-q3fv-295f-qfpf	[email protected]	MitigationVendor Advisory
https://www.vulncheck.com/advisories/n8n-before-redos-via-filter-and-switch-node	[email protected]	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1333	Inefficient Regular Expression Complexity	[email protected]

Affected Products

Product	Versions
n8n n8n	< 1.123.69 >= 2.0.0, < 2.33.4 2.34.0
CPE cpe:2.3:a:n8n:n8n::::::node.js::* cpe:2.3:a:n8n:n8n:2.34.0:::::node.js:: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Sep 1, 2026	Initial Analysis	[email protected]
Aug 21, 2026	CVE Modified	CISA-ADP
Aug 21, 2026	CVE Modified	[email protected]
Aug 20, 2026	New CVE Received	[email protected]