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Release: AWS IoT Greengrass Core v2.18.0 software update on July 8, 2026 - AWS IoT Greengrass
Public component updates

Release: AWS IoT Greengrass Core v2.18.0 software update on July 8, 2026

This release provides version 2.18.0 of the Greengrass nucleus component and updates to AWS-provided components.

Release date: July 8, 2026

Public component updates

The following table lists components provided by AWS that include new and updated features.

Important

When you deploy a component, AWS IoT Greengrass installs the latest supported versions of all of that component's dependencies. Because of this, new patch versions of AWS-provided public components might be automatically deployed to your core devices if you add new devices to a thing group, or you update the deployment that targets those devices. Some automatic updates, such as a nucleus update, can cause your devices to restart unexpectedly.

To prevent unintended updates for a component that is running on your device, we recommend that you directly include your preferred version of that component when you create a deployment. For more information about update behavior for AWS IoT Greengrass Core software, see Update the AWS IoT Greengrass Core software (OTA).

Component Details

Greengrass nucleus

Version 2.18.0 of the Greengrass nucleus is available.

New features

  • Adds support for switching a core device's AWS IoT connectivity to a different AWS account or region through a nucleus configuration deployment. The nucleus validates connectivity to the new endpoints before it applies the change, and reports the terminal deployment status to the source account.

  • Adds support for Windows Server 2025.

Bug fixes and improvements

  • Fixes a startup timing issue on systemd devices by starting the AWS IoT Greengrass Core software only after the system clock synchronizes.

  • Fixes an issue where a component might encounter stale subscriptions after it closes a local IPC stream during an in-progress subscribe request.

  • General bug fixes and improvements.

Stream manager

Version 2.3.1 of the stream manager is available.

Bug fixes and improvements

  • Improves the throughput of stream manager exports to Kinesis Data Streams destinations, especially for small record sizes.

  • Adds shard-aware pacing that distributes records across the shards of the target data stream to keep requests within the per-shard limits of Kinesis Data Streams. To use shard-aware pacing, grant the kinesis:ListShards permission in the Greengrass token exchange role.

  • Adds the STREAM_MANAGER_EXPORTER_KINESIS_INTER_CALL_DELAY_MS configuration parameter, which sets a fallback delay between export requests when stream manager cannot determine the shard layout of the target data stream. The default is 1000 milliseconds. To turn off the fallback delay, set this parameter to 0.

Shadow manager

Version 2.3.15 of the shadow manager is available.

Bug fixes and improvements

  • Fixes an issue where the shadow manager could stop working after a power outage corrupted its local database.

  • Validates the integrity of the local database on startup and recreates the database when it detects corruption.

MQTT bridge

Version 2.3.3 of the MQTT bridge is available.

Bug fixes and improvements

  • Fixes an issue where high concurrent device load could cause the MQTT bridge to stop relaying messages after a dropped PUBACK.

Secret manager

Version 2.2.9 of the secret manager is available.

Bug fixes and improvements

  • General bug fixes and improvements.

Greengrass CLI

Version 2.18.0 of the Greengrass CLI is available.

Updates the component version for the Greengrass nucleus version 2.18.0 release.

Secure tunneling

Version 2.0.1 of the secure tunneling component is available.

Bug fixes and improvements

  • Updates the bundled local proxy binary to version 3.3.0.

  • Fixes concurrency and object-lifetime bugs that could affect tunnel data integrity.

  • Requires TLS 1.2 or later and no longer allows SSLv2, SSLv3, TLS 1.0, or TLS 1.1.