---
id: "CVE-2026-118965"
page: "https://infrastack.ai/live/CVE-2026-118965"
kind: "vulnerability"
aliases: ["CVE-2026-118965"]
title: "Checkmk: path traversal lets a remote site write files and run code"
severity: "critical"
cvss: 9.4
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["checkmk", "distributed-monitoring", "infrastructure", "self-hosted"]
not_affected_if: ["fixed-version-installed", "single-site-only"]
published_at: "2026-11-11T11:17:13+00:00"
first_seen_at: "2026-11-11T11:26:55+00:00"
updated_at: "2026-11-11T11:27:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118965", "first_seen_at": "2026-11-11T11:26:55+00:00"}]
exploit_sources: []
---

# Checkmk: path traversal lets a remote site write files and run code

Link for people: https://infrastack.ai/live/CVE-2026-118965 (this .md is for agents)

Checkmk's discovered host label synchronization has a path traversal flaw. An attacker who controls a remote site in a distributed monitoring setup can write arbitrary files on the central site and execute code as the central site user.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Checkmk version on the central site with `omd version` and compare it to the fixed versions below.
- Check whether any remote sites are connected to the central site in a distributed setup.

## Fix

- Checkmk `2.5.0p19` or later
- Checkmk `2.4.0p40` or later
- Checkmk 2.3.0 is end of life; the sources give no fix for it, so move to a supported release.

## Timeline

- 2026-11-11T11:26:55+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118965

## From the sources

Path traversal in the discovered host label synchronization in Checkmk <2.5.0p19, <2.4.0p40 and 2.3.0 (EOL) allows an attacker in control of a remote site in a distributed monitoring setup to write arbitrary files on the central site and thereby execute code as the central site user.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_