What’s Vulnerable › Vulnerabilities

CVE-2026-86081: n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path

• Severity: high (CVSS 7.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-08 · updated 2026-09-09
• Weakness: CWE-1333

Description

n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the Git node clone operation matched an attacker-controlled destination path against the default N8N_BLOCK_FILE_PATTERNS regular expression. The pattern ^(./).git(/.)$ allowed catastrophic backtracking and ran synchronously in the main n8n process. An authenticated workflow editor could therefore freeze the instance with one workflow execution; the affected default is declared in packages/@n8n/config/src/configs/security.config.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.

Affected products

• n8n-io n8n: from 2.38.0, < 2.38.2; from 2.0.0, < 2.37.7; before 1.123.76

References

• https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76
• https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7
• https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2
• https://github.com/n8n-io/n8n/security/advisories/GHSA-j535-v25q-vx3q

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