GHSA-j535-v25q-vx3q

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GHSA-j535-v25q-vx3q

Summary: n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path

Details: ## Impact The Git node's clone operation matched the destination path against the default `N8N_BLOCK_FILE_PATTERNS` expression, which was written so that a crafted path caused catastrophic backtracking. Evaluation runs synchronously in the main n8n process, so an authenticated user could freeze the instance for everyone with a single workflow execution and no unusual configuration. The patch rewrites the pattern so that matching is linear in the length of the path. ## Patches The issue has been fixed in n8n versions 1.123.76, 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. - Disable the Git node by adding `n8n-nodes-base.git` to the `NODES_EXCLUDE` environment variable. - Set `N8N_BLOCK_FILE_PATTERNS` to a backtracking-safe equivalent pattern to replace the vulnerable default. 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-j535-v25q-vx3q, https://nvd.nist.gov/vuln/detail/CVE-2026-86081, 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], https://github.com/n8n-io/n8n/releases/tag/[email protected]