Resource exhaustion in N8n
CVE-2026-58661
n8n before 2.28.0 (and before 1.123.58 on the 1.x branch) contains a disk space exhaustion vulnerability in the data-table file upload endpoint. The per-request quota check does not account for files already written to the shared temporary directory, allowing an authenticated user to repeatedly upload files that accumulate on disk until the periodic cleanup runs, potentially exhausting available disk space on the host.
EPSS: 0.002 (13.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
Affected products
- N8n — versions 0, 2.28.0, 1.123.58
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory, Mitigation, Vendor Advisory)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-58661?
- CVE-2026-58661 is a medium-severity vulnerability in N8n, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.3/10. Published 2026-07-10.
- How severe is CVE-2026-58661?
- Medium severity. CVSS v3 base score is 4.3 out of 10.