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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n8n-io n8n unaffected
Version Status Constraints
0 affected < 1.123.69
1.123.69 unaffected —
n8n-io n8n unaffected
Version Status Constraints
0 affected < 2.34.1
2.34.1 unaffected —
n8n-io n8n unaffected
Version Status Constraints
0 affected < 2.33.4
2.33.4 unaffected —

No data.

No data.

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Project Subscriptions

Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/n8n-io/n8n/security/advisories/GHSA-q3fv-295f-qfpf cve-icon cve-icon
https://www.vulncheck.com/advisories/n8n-before-redos-via-filter-and-switch-node cve-icon cve-icon
History

Thu, 20 Aug 2026 11:45:00 +0000

Type Values Removed Values Added
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.
Title n8n before 1.123.69 ReDoS via Filter and Switch Node
First Time appeared N8n
N8n n8n
Weaknesses CWE-1333
CPEs cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*
Vendors & Products N8n
N8n n8n
References
Metrics cvssV4_0

{'score': 5.3, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-20T11:37:16.646Z

Reserved: 2026-08-20T10:55:09.093Z

Link: CVE-2026-77082

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-20T12:16:39.717

Modified: 2026-08-20T12:16:39.717

Link: CVE-2026-77082

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T22:30:05Z

Weaknesses