Detections
Analytics
SCA: security update for n8n (GHSA-49m9-pgww-9vq6)
high Tenable Self-Hosted Container Security Plugin ID 440999
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, the
MCP OAuth client registration endpoint accepted unauthenticated requests and stored client data without
adequate resource controls. An unauthenticated remote attacker could exhaust server memory resources by
sending large registration payloads, rendering the n8n instance unavailable. The MCP enable/disable toggle
gates MCP access but did not restrict client registrations, meaning the endpoint is reachable regardless
of whether MCP access is enabled on the instance. This issue has been patched in versions 1.123.32,
2.17.4, and 2.18.1. (CVE-2026-42236)
Solution
Update the n8n library and its related packages to version 1.123.32 or later.See Also
Plugin Details
Severity: High
ID: 440999
Version: Revision 1.9
Type: Local
Family: SCA Checks
Published: 4/30/2026
Updated: 7/2/2026
Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: Low
Score: 3
Percentile: 23.73
Vendor
Vendor Severity: High
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2026-42236
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: High
Base Score: 8.7
Threat Score: 6.6
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
Exploit Ease: No known exploits are available
Patch Publication Date: 4/29/2026
Vulnerability Publication Date: 4/29/2026
Reference Information
CVE: CVE-2026-42236
cwe: CWE-770