AI agent vulnerability · n8n

CVE-2026-58661: n8n: Authenticated Users Can Exhaust Temporary Disk Storage via Data-Table File Uploads

mediumCVSS 4.0 5.3GHSA-w867-jm58-p9pv

Impact 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. This causes temporary files to accumulate on disk until the periodic cleanup runs, potentially exhausting available disk space on the host.

Published Jul 22, 2026

Affected packages

n8n

Ecosystem: npm
Affected: >= 2.0.0, < 2.28.0
Fixed in: 2.28.0
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: < 1.123.58
Fixed in: 1.123.58
Check: npm ls n8n

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

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. This causes temporary files to accumulate on disk until the periodic cleanup runs, potentially exhausting available disk space on the host.

Patches

Users should upgrade to the patched version once available to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations:

Restrict n8n instance access to fully trusted users only.
Set uploadMaxFileSize to a low value to limit individual upload size.
Monitor and alert on disk usage in the n8n temporary upload directory.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Credited to CodeByMoriarty.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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