CVE-2026-58661

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.

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Weakness Type (CWE)

CWE-770 CWE-770

References

Other 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

Frequently Asked Questions

What is 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.

How do I check if I'm vulnerable to CVE-2026-58661? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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