CVE-2026-27496
n8n has In-Process Memory Disclosure in its Task Runner
Description
## Impact An authenticated user with permission to create or modify workflows could use the JavaScript Task Runner to allocate uninitialized memory buffers. Uninitialized buffers may contain residual data from the same Node.js process — including data from prior requests, tasks, secrets, or tokens — resulting in information disclosure of sensitive in-process data. - Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`. - In external runner mode, the impact is limited to data within the external runner process. ## Patches The issue has been fixed in n8n versions >= 1.123.22, >= 2.10.1 , and >= 2.9.3. Users should upgrade to this version or later to remediate the vulnerability. ## Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Limit workflow creation and editing permissions to fully trusted users only. - Use external runner mode (`N8N_RUNNERS_MODE=external`) to isolate the runner process. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
How to fix CVE-2026-27496
To remediate CVE-2026-27496, upgrade the affected package to a fixed version below.
- —upgrade to 1.123.22 or later
Is CVE-2026-27496 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.123.22
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |