Argument Injection in Kubernetes Special Agent of Checkmk
CVE-2026-121374

9.4CRITICAL

Key Information:

Vendor

Checkmk Gmbh

Status
Checkmk
Vendor
CVE Published:
11 November 2026

What is CVE-2026-121374?

A vulnerability exists in Checkmk's Kubernetes special agent that allows users with editing permissions to exploit crafted node roles in the 'Exclude nodes based on their role' criteria. This leads to the potential for unauthorized file writing to arbitrary locations, which could result in code execution as the site user. This risk affects multiple versions of Checkmk, emphasizing the importance of timely updates and patches.

Affected Version(s)

Checkmk 2.5.0 < 2.5.0p19

Checkmk 2.4.0 < 2.4.0p40

Checkmk 2.3.0

References

https://checkmk.com/werk/17994
vendor-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.