What is the CVSS score of CVE-2026-26009?

CVE-2026-26009 has a CVSS 3.1 base score of 9.9 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Which versions of Catalyst are affected by CVE-2026-26009?

A critical vulnerability in Catalyst game server hosting platform allows unauthenticated attackers to execute arbitrary code with root privileges on affected systems, potentially compromising entire…

How to fix or mitigate CVE-2026-26009?

Within 24 hours: Identify all systems running Catalyst and isolate them from production networks if possible; disable remote access to Catalyst administrative interfaces and restrict to VPN-only access. Within 7 days: Implement network segmentation to limit lateral movement from compromised Catalyst instances; conduct forensic analysis of access logs for signs of exploitation; establish alternative game server management procedures. Within 30 days: Evaluate migration to alternative platforms without this vulnerability; coordinate with vendor on patch timeline and interim security updates; perform full security assessment of potentially compromised systems.

Catalyst CVE-2026-26009

CRITICAL

OS Command Injection (CWE-78)

2026-02-10 security-advisories@github.com

RCE

9.9

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.9 CRITICAL

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:02 vuln.today

CVE Published

Feb 10, 2026 - 19:16 nvd

CRITICAL 9.9

DescriptionGitHub Advisory

Catalyst is a platform built for enterprise game server hosts, game communities, and billing panel integrations. Install scripts defined in server templates execute directly on the host operating system as root via bash -c, with no sandboxing or containerization. Any user with template.create or template.update permission can define arbitrary shell commands that achieve full root-level remote code execution on every node machine in the cluster. This vulnerability is fixed in commit 11980aaf3f46315b02777f325ba02c56b110165d.