CVE-2026-56777

Description

## Impact An authenticated user with permission to create or modify workflows containing a Python Code node could bypass the AST security validator and access the task executor module namespace. On self-hosted instances where `N8N_BLOCK_RUNNER_ENV_ACCESS=false` is set, this extended to disclosure of environment variables accessible to the task runner process. This issue only affects instances where the Python Task Runner is enabled and `N8N_BLOCK_RUNNER_ENV_ACCESS=true`. ## Patches The issue has been fixed in n8n versions 2.25.7, and 2.26.2. 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: - Limit workflow creation and editing permissions to fully trusted users only. - Disable the Python Code node by adding `n8n-nodes-base.code` to the `NODES_EXCLUDE` environment variable, or disable the Python Task Runner entirely. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

How to fix CVE-2026-56777

To remediate CVE-2026-56777, upgrade the affected package to a fixed version below.

• —upgrade to 2.26.2 or later

Is CVE-2026-56777 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• >= 2.26.0, < 2.26.2

CVSS scores

References (2)

• PATCHgithub.com/n8n-io/n8n
• WEBgithub.com/n8n-io/n8n/security/advisories/GHSA-jwm3-qcfw-c5pp