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

中 4.3CVE-2026-58661 · GHSA-w867-jm58-p9pv · 10/07/2026 公開 · 29/10/2026 更新

要点

CVE-2026-58661 は n8n (n8n), n8n に影響する深刻度「中」 (CVSS 4.3) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.39%（全脆弱性の 32.7% より高い）。
対処：2.28.0, 1.123.58 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
n8n n8n	`≥ 2.0.0, < 2.28.0< 1.123.58`	`2.28.01.123.58`
n8n npm	`≥ 2.0.0, < 2.28.0< 1.123.58`	`2.28.01.123.58`

概要

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.

NVD の説明

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.