What’s Vulnerable › Vulnerabilities

CVE-2026-58661: n8n - Disk Space Exhaustion via Data-Table File Upload Endpoint

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-10 · updated 2026-10-29
• Weakness: CWE-770

Description

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.

Affected products

• n8n-io n8n: before 1.123.58; from 2.0.0 before 2.28.0 — fixed in 1.123.58, 2.28.0
• n8n-io n8n: from 2.0.0 before 2.28.0 — fixed in 2.28.0

How to fix

Upgrade to a fixed version: n8n-io n8n 1.123.58, 2.28.0; n8n-io n8n 2.28.0. Check the vendor advisory for mitigations.

References

• https://github.com/n8n-io/n8n/security/advisories/GHSA-w867-jm58-p9pv
• https://www.vulncheck.com/advisories/n8n-disk-space-exhaustion-via-data-table-file-upload-endpoint

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