(2026-R40) Security updates

This release includes new GKE versions that use updated Container-Optimized OS images. These updated images are cumulative, incorporating security fixes from all Container-Optimized OS versions released since the previous GKE release.

To identify the specific vulnerabilities that were resolved in each updated Container-Optimized OS image, see the Security release notes for that image. The following table includes links to the release notes for each updated Container-Optimized OS image:

GKE version · Container-Optimized OS version · Details

1.31.14-gke.2759000 · cos-121-18867-584-7 · cos-121-18867-584-7 release notes

1.32.13-gke.2504000 · cos-121-18867-584-7 · cos-121-18867-584-7 release notes

1.33.13-gke.1721000 · cos-121-18867-584-7 · cos-121-18867-584-7 release notes

1.34.11-gke.1209000 · cos-125-19216-655-12 · cos-125-19216-655-12 release notes

1.35.8-gke.1626000 · cos-125-19216-655-12 · cos-125-19216-655-12 release notes

1.36.4-gke.1495000 · cos-129-19506-448-20 · cos-129-19506-448-20 release notes

1.38.0-gke.1002000+preview · cos-beta-133-19999-44-28 · cos-beta-133-19999-44-28 release notes