GHSA-679f-58pq-4v2c

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GHSA-679f-58pq-4v2c

Summary: n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service

Details: ## Impact The Instance AI workflow summary built its result with get-or-create-then-nested-write idioms keyed by node names and connection keys taken from the stored workflow. Those are arbitrary strings: the restricted-name guard n8n shows in the editor is client-side and is bypassed by posting the workflow to the REST API directly. So a reserved key such as `__proto__` resolved up the prototype chain instead of creating an own key, and the write landed on `Object.prototype` in the main n8n process, affecting every later request. The patch builds the summary with null-prototype accumulators and validates the keys it accepts, so reserved names cannot reach the prototype chain. ## Patches The issue has been fixed in n8n versions 2.37.7 and 2.38.2. Users should upgrade to one of these versions or later to remediate the vulnerability. ## Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Restrict n8n instance access to fully trusted users only. - Remove or leave unconfigured the `N8N_INSTANCE_AI_MODEL*` environment variables to prevent the Instance AI module from reaching the vulnerable code path. - Restart the n8n process to clear any in-memory prototype pollution if an attack is suspected. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

References: https://github.com/n8n-io/n8n/security/advisories/GHSA-679f-58pq-4v2c, https://nvd.nist.gov/vuln/detail/CVE-2026-86078, https://github.com/n8n-io/n8n, https://github.com/n8n-io/n8n/releases/tag/[email protected], https://github.com/n8n-io/n8n/releases/tag/[email protected]