n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path
- Product
- n8n
- CVE
- CVE-2026-86081
- Affected
- npm/n8n < 1.123.76, >= 2.0.0 and < 2.37.7, >= 2.38.0 and < 2.38.2
- Fixed in
- 1.123.76
Last verified against sources: October 26, 2026
Am I affected?
n8n: affected npm/n8n < 1.123.76, >= 2.0.0 and < 2.37.7, >= 2.38.0 and < 2.38.2. Fixed in 1.123.76.
- Check your version: run
npm ls n8n. Versions < 1.123.76 of n8n are affected. [1]
What to do now
- Upgrade to the fixed version: run
npm install n8n@1.123.76(first patched version 1.123.76). [1] - Upgrade to n8n 1.123.76, 2.37.7, or 2.38.2 or later to remediate the vulnerability. [1]
- Restrict n8n instance access to fully trusted users only. [1]
- Disable the Git node by adding
n8n-nodes-base.gitto theNODES_EXCLUDEenvironment variable. [1] - Set
N8N_BLOCK_FILE_PATTERNSto a backtracking-safe equivalent pattern to replace the vulnerable default. [1]
General practice, not from the source: if the affected software could read tokens or credentials, rotate them after upgrading; pin versions and review changes before updating tools your agents run.
What happened
Impact
- An authenticated user could freeze the instance for everyone with a single workflow execution and no unusual configuration. [1]
What was done
Sources
- GHSA-j535-v25q-vx3q — GitHub Advisory Database
Every statement above was checked against these sources before publishing. Spotted an error? Tell us and we will correct it with a dated note.
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[CVE-2026-86081] n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path
Product: n8n | Affected: npm/n8n < 1.123.76, >= 2.0.0 and < 2.37.7, >= 2.38.0 and < 2.38.2 | Fixed in: 1.123.76
Summary: 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.
Source & remediation on AgentArmorHQ: https://agentarmorhq.com/incidents/2026/09/cve-2026-86081-n8nCorrections
Report an error or request a correction. We review requests within 5 business days and add a dated correction note.
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