CVE-2026-77077: n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis…

PriorityP350high7.6CVSS 3.1

AVNACLPRLUINSUCHILAL

EPSS

0.31%

24.3th percentile

n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constructors such as EventEmitter, allowing an authenticated user with Code node access to exploit prototype pollution to execute arbitrary commands within the runner container. Because the polluted prototype is a process-wide object, the corruption persists across other tenants' Code node executions on the same shared runner. On v1.x instances without task runners enabled, Code node JavaScript runs directly in the main n8n process, where the impact could be higher.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
n8n-io	n8n	< 1.123.69	1.123.69
n8n-io	n8n	>= 2.0.0 < 2.33.4	2.33.4
n8n-io	n8n	>= 2.34.0 < 2.34.1	2.34.1
n8n	n8n	< 1.123.69	1.123.69
n8n	n8n	—	—
n8n	n8n	>= 2.33.0 < 2.33.4	2.33.4

CVSS provenance

nvdv3.17.6HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

nvdv4.07.2HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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