n8n: Authenticated Users Can Exhaust Temporary Disk Storage via Data-Table File Uploads
MediumCVE-2026-58661 · Published Jul 22, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| n8n npm | >= 2.0.0, < 2.28.0 | 2.28.0 |
| < 1.123.58 | 1.123.58 |
Details and references
## 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.
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-770
- Also known as
- CVE-2026-58661
- github.com/n8n-io/n8n/security/advisories/GHSA-w867-jm58-p9pv
- nvd.nist.gov/vuln/detail/CVE-2026-58661
- github.com/n8n-io/n8n
- github.com/n8n-io/n8n/releases/tag/n8n@1.123.58
- github.com/n8n-io/n8n/releases/tag/n8n@2.28.0
- www.vulncheck.com/advisories/n8n-disk-space-exhaustion-via-data-table-file-upload-endpoint
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|---|---|---|---|
| Jul 22 | n8n: AI Agents Project Viewer Privilege Escalation via run_node_tool CVE-2026-65015Highfixed in 2.29.8, 2.30.1 | High | 2.29.8, 2.30.1 |
| Jul 22 | n8n: Race Condition in Git Clone Node Allows Authenticated Users to Achieve Remote Code Execution CVE-2026-65598Highfixed in 1.123.64, 2.29.8, 2.30.1 | High | 1.123.64, 2.29.8, 2.30.1 |
| Jul 22 | n8n: DOM-Based XSS via Unsandboxed iframe srcdoc in HTML Preview CVE-2026-65597Highfixed in 1.123.64, 2.29.8, 2.30.1 | High | 1.123.64, 2.29.8, 2.30.1 |
| Jul 22 | n8n: Stored DOM XSS via Resource Locator `cachedResultUrl` CVE-2026-65592Highfixed in 1.123.64, 2.29.8, 2.30.1 | High | 1.123.64, 2.29.8, 2.30.1 |
| Jul 22 | n8n: Google Service Account Private Key Exposed in JWT Header CVE-2026-65599Mediumfixed in 1.123.64, 2.29.8, 2.30.1 | Medium | 1.123.64, 2.29.8, 2.30.1 |
| Jul 22 | n8n: Shared Credential Header Leak via HTTP Request Pagination Expression CVE-2026-59209Highfixed in 1.123.61, 2.27.4, 2.28.1 | High | 1.123.61, 2.27.4, 2.28.1 |