Resolves #48988. I ran `make update-go version=1.26.5`. - [X] Changes file added for user-visible changes in `changes/`, `orbit/changes/` or `ee/fleetd-chrome/changes`. ## Testing - [X] QA'd all new/changed functionality manually Fleet: <img width="301" height="102" alt="Screenshot 2026-07-09 at 8 41 49 AM" src="https://github.com/user-attachments/assets/baf76ce7-6192-4506-a9db-52f5318939ee" /> fleetctl: ``` fleetctl --version fleetctl - version orbit-v1.57.0-402-ge3d0c005dc branch: 48988-update-go-1.26.5 revision: e3d0c005dc6698c024ad47a124c99e4f264855a0 build date: 2026-07-09 build user: lucas go version: go1.26.5 ``` Also verified orbit in Linux: <img width="582" height="121" alt="Screenshot 2026-07-09 at 8 51 55 AM" src="https://github.com/user-attachments/assets/65672676-8010-45a1-8c28-9f9959e72134" /> ## fleetd/orbit/Fleet Desktop - [X] Verified compatibility with the latest released version of Fleet (see [Must rule](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/workflows/fleetd-development-and-release-strategy.md)) - [X] Verified auto-update works from the released version of component to the new version (see [tools/tuf/test](../tools/tuf/test/README.md)) <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Chores** * Updated the project and all included tooling modules to Go 1.26.5. * Refreshed build images used by desktop Linux, load testing, and related utilities to the newer Go toolchain. * Updated change log entries to reflect the Go version bump. * **Bug Fixes** * Improved the automation that refreshes Go-pinned Docker image references to resolve and apply correct digests, helping prevent broken build images. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
Proxy for MDM requests used in seamless migrations, as described in https://github.com/fleetdm/fleet/issues/19387.
Usage
Usage of ./mdmproxy:
-auth-token string
Auth token for remote flag updates (remote updates disabled if not provided)
-existing-hostname string
Hostname for existing MDM server (eg. 'mdm.example.com') (required)
-existing-url string
Existing MDM server URL (full path) (required)
-fleet-url string
Fleet MDM server URL (full path) (required)
-migrate-percentage int
Percentage of clients to migrate from existing MDM to Fleet
-migrate-udids string
Space/newline-delimited list of UDIDs to migrate always
-server-address string
Address for server to listen on (default ":8080")
Example invocation
mdmproxy --migrate-udids '' --auth-token foo --existing-url https://3.14.233.249 --existing-hostname micromdm.example.com --fleet-url https://example.cloud.fleetdm.com --migrate-percentage 0
Check migration status
To check the migration status for a given UDID, provide the --migrate-udids and
--migrate-percentage flags with the --check flag:
$ go run . --migrate-percentage=50 --check E5C6DBBA-D5CC-4DB6-9560-995F17FB7A59
E5C6DBBA-D5CC-4DB6-9560-995F17FB7A59 IS NOT migrated
$ go run . --migrate-percentage=50 --check 575424CB-09D7-4CAD-8A7A-D3511FE8A7E2
575424CB-09D7-4CAD-8A7A-D3511FE8A7E2 IS migrated
When the --check flag is used, the program prints the migration status and exits. The server is not started.