Input validation error in n8n - #VU134438
Published: June 12, 2026
Vulnerability identifier: #VU134438
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: n8n
Affected software:
n8n
n8n
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the Compression node Decompress operation when processing attacker-supplied ZIP archives through a public webhook workflow. A remote attacker can send a small crafted compressed archive to cause a denial of service.
The issue can exhaust memory and terminate the process, disrupting all workflows running in the same instance.
Remediation
Install security update from vendor's website.