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

Medium 5.3 Published 10 Jul 2026 Updated 29 Oct 2026

An authenticated user can exhaust host disk space by repeatedly uploading files to the data-table endpoint, bypassing quota checks.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-58661?

CVE-2026-58661 is a medium-severity denial of service vulnerability in N8n N8n, published on 10 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-770

Which versions are affected by CVE-2026-58661?

4 open source packages ship an affected version, including n8n. It affects 1 product.

Package	Affected	Fixed in
`n8n` npm	All versions	`1.123.58`
`n8n` npm	All versions	`1.123.58`
`n8n` npm	From `2.0.0`	`2.28.0`
`n8n` npm	From `2.0.0`	`2.28.0`

Products include N8n N8n.

How do I fix CVE-2026-58661?

Upgrade n8n to a fixed version for your release line: 1.123.58 or 2.28.0.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-58661 being exploited?

There is no known exploitation of CVE-2026-58661 in the wild and no public exploit code.

All N8n N8n vulnerabilities

Sources

Also known as GHSA-w867-jm58-p9pv, MINI-3222-2rx2-frgc.