n8n: Authenticated Users Can Exhaust Temporary Disk Storage via Data-Table File Uploads
- Product
- n8n
- CVE
- CVE-2026-58661
- Affected
- npm/n8n >= 2.0.0, < 2.28.0 and npm/n8n < 1.123.58
- Fixed in
- 2.28.0 and 1.123.58
Last verified against sources: October 26, 2026
Am I affected?
n8n: affected npm/n8n >= 2.0.0, < 2.28.0 and npm/n8n < 1.123.58. Fixed in 2.28.0 and 1.123.58.
- Check your version: run
npm ls n8n. Versions >= 2.0.0, < 2.28.0 of n8n are affected. [1]
What to do now
- Upgrade to the fixed version: run
npm install n8n@2.28.0(first patched version 2.28.0). [1] - Restrict n8n instance access to fully trusted users only. [1]
- Set
uploadMaxFileSizeto a low value to limit individual upload size. [1] - Monitor and alert on disk usage in the n8n temporary upload directory. [1]
General practice, not from the source: if the affected software could read tokens or credentials, rotate them after upgrading; pin versions and review changes before updating tools your agents run.
What happened
- An authenticated user can repeatedly upload files to the data-table upload endpoint, bypassing the per-request quota check, which does not account for files already written to the shared temporary directory. [1]
- This causes temporary files to accumulate on disk until the periodic cleanup runs, potentially exhausting available disk space on the host. [1]
Impact
- Temporary files accumulate on disk until the periodic cleanup runs, potentially exhausting available disk space on the host. [1]
What was done
Sources
- GHSA-w867-jm58-p9pv — GitHub Advisory Database
Every statement above was checked against these sources before publishing. Spotted an error? Tell us and we will correct it with a dated note.
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[CVE-2026-58661] n8n: Authenticated Users Can Exhaust Temporary Disk Storage via Data-Table File Uploads
Product: n8n | Affected: npm/n8n >= 2.0.0, < 2.28.0 and npm/n8n < 1.123.58 | Fixed in: 2.28.0 and 1.123.58
Summary: An authenticated user can repeatedly upload files to the data-table upload endpoint, bypassing the per-request quota check, which does not account for files already written to the shared temporary directory.
Source & remediation on AgentArmorHQ: https://agentarmorhq.com/incidents/2026/07/cve-2026-58661-n8nCorrections
Report an error or request a correction. We review requests within 5 business days and add a dated correction note.
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