[Release] Checkmk stable release 1.6.0p26

Dear friends of Checkmk,

the new stable release 1.6.0p26 of Checkmk is ready for download.

This maintenance release ships with 16 changes affecting all editions of Checkmk,
3 Enterprise Edition specific changes and 0 Managed Services Edition specific changes.

This release ships 5 security updates for Checkmk. We recommend all users of
previous versions to update to this release.

Changes in all Checkmk Editions:

Checks & agents:

  • 13149 FIX: isstore, isclienttype: fix performance problems
  • 13146 FIX: chrony: warn if synchronization is lost
    NOTE: Please refer to the migration notes!
  • 11812 FIX: esx multipath: Skip devices without LUN ID
  • 13040 FIX: prefer ucd_mem over hr_mem in case of ironport 14
    NOTE: Please refer to the migration notes!


  • 13068 SEC: Fix XSS in Graph
  • 13069 SEC: Fix file path manipulation
  • 13067 SEC: Fix path traversal vulnerability
  • 13192 SEC: Fix potential XSS in pnp_template.py
  • 13276 FIX: Distributed setup: Prevent timeouts during synchronization
  • 13240 FIX: Fix disabling of vanished services in service discovery
  • 12852 FIX: Hosts/Folders: Fix TypeError when displaying the network scan attribute
  • 13277 FIX: Prevent possible broken synchronization to remote sites

Site management:

  • 12665 FIX: OMD: Fix potential performance issue when system wide LDAP authorization is enabled

User interface:

  • 13111 FIX: Fix painter “Service notification number”
  • 12980 FIX: check_http: Fix escaping of URL if “Clickable URLs” option is used
  • 13106 FIX: Fix missing spaces on CSV and JSON export of views

Changes in the Checkmk Enterprise Edition:


  • 13103 FIX: Fix missing timeout on first connection
  • 13102 FIX: ServiceNow: Improve exception handling

Reporting & availability:

  • 13193 SEC: XSS in report editing

Changes in the Checkmk Managed Services Edition:


You can download Checkmk from our download page:

Please mail bug reports and qualified feedback to feedback@checkmk.com.
We greatly thank you for using Checkmk and wish you a successful monitoring,

Your Checkmk Team

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