CVE-2026-103251: n8n before 1.123.80, 2.39.6, and 2.40.1 Package Install Validation Bypass via PubSub

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-01 · updated 2026-10-01
Weakness: CWE-862

Description

n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a validation bypass vulnerability in the community package installation handler for queue mode deployments. Attackers with Redis write access can bypass name validation, permission checks, checksum verification, and npm safety checks to install arbitrary npm packages across all cluster instances without authentication.

Affected products

n8n-io n8n: before 1.123.80; from 2.0.0 before 2.39.6; from 2.40.0 before 2.40.1 — fixed in 1.123.80, 2.39.6, 2.40.1

How to fix

Upgrade to a fixed version: n8n-io n8n 1.123.80, 2.39.6, 2.40.1. Check the vendor advisory for mitigations.

References

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