CVE-2026-0863 is a critical sandbox escape vulnerability affecting n8n, an open-source workflow automation platform. By leveraging string formatting and exception handling, an authenticated attacker with basic permissions can bypass the python-task-executor sandbox and execute arbitrary Python code on the underlying operating system. This vulnerability carries a CVSS score of 9.9 (CRITICAL) due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability, potentially leading to a full n8n instance takeover in "Internal" execution mode. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, indicating high awareness.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 1.123.14CPE matchmatch criteria | cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* | ||
>= 2.0.0, <= 2.3.5CPE matchmatch criteria | cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* | ||
>= 2.4.0, <= 2.4.2CPE matchmatch criteria | cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 1.0 Bluesky, 0.5 Mastodon, and 1.6 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.