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n8n CVE-2026-71539

| EUVDEUVD-2026-60943 HIGH
Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
2026-08-18 GitHub_M GHSA-62jr-cqgr-xmh7
8.9
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.9 HIGH
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:L/SA:L/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
vuln.today AI
8.5 HIGH

Network vector, low privileges, and high complexity for race win; scope changes because planted node code executes in server context affecting the host.

3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:L/SA:L

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Aug 18, 2026 - 16:17 EUVD
Source Code Evidence Fetched
Aug 18, 2026 - 15:27 vuln.today
Analysis Generated
Aug 18, 2026 - 15:27 vuln.today
CVE Published
Aug 18, 2026 - 14:43 cve.org
HIGH 8.9

DescriptionCVE.org

n8n is an open source workflow automation platform. Prior to 1.123.64, 2.29.8, and 2.30.1, the Git node clone operation allows an authenticated workflow user to swap a validated directory for a symlink before cloning, planting a crafted repository in the community node directory that loads as a custom JavaScript node after restart and executes arbitrary code on the server. This issue is fixed in versions 1.123.64, 2.29.8, and 2.30.1.

AnalysisAI

Remote code execution in n8n workflow automation platform (all versions prior to 1.123.64, 2.29.8, and 2.30.1) stems from a TOCTOU race condition in the Git node's clone operation, allowing any low-privileged authenticated user to achieve arbitrary JavaScript execution on the server. The attacker wins a race between path validation and the actual clone, replacing a legitimate directory with a symlink to plant a crafted repository in n8n's community node directory - which the platform loads and executes as trusted JavaScript on the next restart. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Vulnerability AssessmentAI

Exploitation Exploitation requires: (1) a valid n8n user account with at minimum workflow creation and execution permissions (PR:L confirmed by CVSS vector); (2) the Git node must not be excluded via the NODES_EXCLUDE environment variable - it is available by default; (3) the attacker must win a filesystem TOCTOU race window (AC:H/AT:P - high complexity with a specific attack precondition), which may require repeated attempts or scripted timing; (4) a subsequent n8n server restart must occur for the planted node to be loaded and executed, either triggered by the attacker or occurring naturally. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.9 (AV:N/AC:H/AT:P/PR:L/UI:N) correctly reflects that exploitation is non-trivial: AC:H and AT:P acknowledge the race condition timing requirement and prerequisite conditions, specifically that the Git node must be available and the attacker must be able to create and execute workflows. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The primary fix is to upgrade n8n to one of the three patched releases: 1.123.64 (for 1.x deployments), 2.29.8 (for 2.0.x-2.29.x deployments), or 2.30.1 (for 2.30.x deployments). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Disable or restrict access to the Git node across all n8n instances and audit all users with workflow creation privileges to identify who legitimately requires this access; document which automations depend on Git functionality for recovery planning. …

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CVE-2026-71539 vulnerability details – vuln.today

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