Prototype pollution in n8n - CVE-2026-54312
Published: June 16, 2026
Vulnerability identifier: #VU134568
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-54312
CWE-ID: CWE-1321
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 cause a denial of service.
The vulnerability exists due to improperly controlled modification of object prototype attributes in the Microsoft SQL node when processing a crafted table parameter. A remote user can supply a crafted table parameter to cause a denial of service.
The issue can pollute Object.prototype process-wide for the lifetime of the server process, causing application-wide validation failures until the service is restarted.
How to mitigate CVE-2026-54312
Install security update from vendor's website.