Vulnerability in N8n-Io N8n
CVE-2026-118646
n8n before 1.123.85, 2.43.5, and 2.44.1 contains a regular expression denial of service vulnerability that allows authenticated members to block the event loop via crafted glob patterns. Attackers who can create and run workflows can submit a wildcard-heavy File(s) Selector pattern causing exponential backtracking, making the UI, API, webhooks, and health checks unresponsive until restart.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-m7gv-mpg5-7c9v (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-1.123.85-2.43.5-and-2.44.1-redos-via-re… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-118646?
- CVE-2026-118646 is a medium-severity vulnerability in N8n-Io N8n, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2026-10-28.
- How severe is CVE-2026-118646?
- Medium severity. CVSS v3 base score is 6.5 out of 10.