Use of uninitialized resource in n8n - CVE-2026-27496
Published: April 23, 2026
Vulnerability identifier: #VU127212
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-27496
CWE-ID: CWE-908
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: n8n
Affected software:
n8n
n8n
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to use of uninitialized memory buffers in the JavaScript Task Runner when executing attacker-controlled workflows. A remote user can allocate uninitialized memory buffers to disclose sensitive information.
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.
How to mitigate CVE-2026-27496
Install security update from vendor's website.