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Back to active CVEs
Critical · CVSS 9.4CVE-2026-120495

Arbitrary file write and code execution via crafted Synthetic Monitoring agent dataCVE-2026-120495

Answer in brief

CVE-2026-120495 records a Critical severity (CVSS 9.4) vulnerability in Arbitrary file write and code execution via crafted Synthetic Monitoring agent data. The current sources do not mark it as known exploited. The current feed maps Checkmk GmbH/Checkmk (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 11, 2026Updated Nov 11, 2026Source checked Nov 11, 2026First seen by HOL Nov 11, 2026Material review Nov 11, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Checkmk GmbH/Checkmk (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Checkmk GmbH/Checkmkgeneric>=2.5.0 <2.5.0p19 || >=2.4.0 <2.4.0p40 || 2.3.02.5.0p19, 2.4.0p40

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Checkmk GmbH/Checkmk.
  2. 2Review the reported fix. Update Checkmk GmbH/Checkmk to 2.5.0p19 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 11, 2026

Sources and claim methodology

  • Source referencecheckmk.com
Upstream source description

Path traversal in the Synthetic Monitoring "Robotmk" test service of Checkmk <2.5.0p19, <2.4.0p40, and 2.3.0 (EOL) allows an attacker who controls the agent output of a monitored host's check output for a host to inject a crafted robot output to define the contents and location for the generated HTML log, leading to code execution as the site user.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Path traversal in host label synchronization allows code execution on the central site from a remote siteSame checkmk gmbh/checkmk package
  • Arbitrary file write and code execution via excluded node roles in Kubernetes special agentSame checkmk gmbh/checkmk package

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-23
Source
CVE List V5
Source checked
Nov 11, 2026
References
1 linked source
Open source record