Istio add-on version change log

Patch updates
Patch updates are delivered automatically by IBM and don't contain any feature updates or changes in the supported add-on and cluster versions.
Release updates
Release updates contain new features or changes in the supported add-on or cluster versions. You must manually apply release updates to your cluster autoscaler add-on.

To view a list of add-ons and the supported cluster versions, run the following command or see the Supported cluster add-ons table.

ibmcloud ks cluster addon versions

Review the version history for Istio.

Version 1.29

Version 1.29 - 1.29.4_02100, released 17 June 2026

Default version

Version 1.28

Version 1.28 - 1.28.8_02100, released 17 June 2026

Default version

Version 1.28.6, released 30 April 2026

Review the changes that are included in version 1.28.6 of the managed Istio add-on.

Previous version

1.27.9

Current version

1.28.6

Updates in this version

See the Istio release notes for Istio 1.28.0, Istio 1.28.1, Istio 1.28.2, Istio 1.28.3, Istio 1.28.4, Istio 1.28.5, and Istio 1.28.6.

Resolves the following CVEs:

Version 1.27

Version 1.27.9, released 28 April 2026

Review the changes that are included in version 1.27.9 of the managed Istio add-on.

Previous version

1.27.8

Current version

1.27.9

Updates in this version

See the Istio release notes for Istio 1.27.9.

Resolves the following CVEs:

Version 1.27.8, released 27 March 2026

Review the changes that are included in version 1.27.8 of the managed Istio add-on.

Previous version

1.26.8

Current version

1.27.8

Updates in this version

See the Istio release notes for Istio 1.27.0, Istio 1.27.1, Istio 1.27.2, Istio 1.27.3, Istio 1.27.4, Istio 1.27.5, Istio 1.27.6, Istio 1.27.7, and Istio 1.27.8.

Resolves the following CVEs:

Version 1.26

Version 1.26.6, released 15 December 2025

Review the changes that are included in version 1.26.6 of the managed Istio add-on.

Previous version

1.25.5

Current version

1.26.6

Updates in this version

See the Istio release notes for Istio 1.26.0, Istio 1.26.1, Istio 1.26.2, Istio 1.26.3, Istio 1.26.4, Istio 1.26.5, and , Istio 1.26.6,

Resolves the following CVEs:

Version 1.26.8, released 21 January 2025

Review the changes that are included in version 1.26.8 of the managed Istio add-on.

Previous version

1.26.6

Current version

1.26.8

Updates in this version

See the Istio release notes for Istio 1.26.7, and , Istio 1.26.8,

Resolves the following CVEs:

Version 1.25

Version 1.25.5, released 05 November 2025

Review the changes that are included in version 1.25.5 of the managed Istio add-on.

Previous version

1.24.6

Current version

1.25.5

Updates in this version

This is the final version of addon-istio 1.25. addon-istio 1.25.5 is unsupported on 15 May 2026. Update your Istio components to the latest patch version of Istio 1.27 that is supported by IBM Cloud Kubernetes Service before that date.

addon-istio 1.27 is available and supported on IBM Cloud Kubernetes Service versions 1.32 and 1.33. To upgrade from 1.25 to 1.27, follow Updating to a minor version of the Istio add-on. You must complete both minor upgrades, from 1.25 to 1.26 and from 1.26 to 1.27.

See the Istio release notes for Istio 1.25.0, Istio 1.25.1, Istio 1.25.2, Istio 1.25.3, Istio 1.25.4, and Istio 1.25.5.

Resolves the following CVEs:

Version 1.24

Version 1.24.6, released 26 September 2025

Review the changes that are included in version 1.24.6 of the managed Istio add-on.

Previous version

1.23.6

Current version

1.24.6

Updates in this version

The Istio managed add-on is migrating from the in-cluster operator in 1.23.x to a cyclic Helm upgrade installation in 1.24. This upgrade requires a different process than earlier versions, so review the migration documentation before getting started.

With the move to a Helm-based installation, the gateways are switching from the istio/gateways chart that the in-cluster operator used to the istio/gateway chart that Istio recommends for Helm-based Istio. The main change is that the Istio gateways are set to image: auto to have the sidecar injector automatically select the image to use.

With the move away from the IstioOperator CustomResource to use the Helm value.yaml charts, addon-istio is no longer supporting more than 1 default gateway (istio-ingressgateway-public-2 and istio-ingressgateway-public-3). However, the default gateway's value.yaml can be customized by the user and the user can install the previous gateways as additional custom gateways by using Helm.

See the Istio release notes for Istio 1.24.0, Istio 1.24.1, Istio 1.24.2, Istio 1.24.3, Istio 1.24.4, Istio 1.24.5, and Istio 1.24.6.

Resolves the following CVEs:

Version 1.23

Version 1.23.6, released 29 April 2025

Review the changes that are included in version 1.23.6 of the managed Istio add-on.

Previous version
1.23.5
Current version
1.23.6
Updates in this version
See the Istio release notes for Istio 1.23.6.
Resolves the following CVEs:

Version 1.23.5, released 4 March 2025

Review the changes that are included in version 1.23.5 of the managed Istio add-on.

Previous version
1.23.4
Current version
1.23.5
Updates in this version
See the Istio release notes for Istio 1.23.5.
Expanded testing and support to IKS 1.31.
Resolves the following CVEs:

Version 1.23.1, released 20 September 2024

Review the changes that are included in version 1.23.1 of the managed Istio add-on.

Previous version
1.22.4
Current version
1.23.1
Updates in this version
See the Istio release notes for Istio 1.23.0 and Istio 1.23.1.
Resolves the following CVEs:

Version 1.23.4, released 28 Jan 2025

Review the changes that are included in version 1.23.4 of the managed Istio add-on.

Previous version
1.23.3
Current version
1.23.4
Updates in this version
See the Istio release notes for Istio 1.23.4.
Resolves the following CVEs:

Version 1.23.3, released 3 Dec 2024

Review the changes that are included in version 1.23.3 of the managed Istio add-on.

Previous version
1.23.2
Current version
1.23.3
Updates in this version
See the Istio release notes for Istio 1.23.3.
Resolves the following CVEs:

Version 1.23.2, released 9 Oct 2024

Review the changes that are included in version 1.23.2 of the managed Istio add-on.

Previous version
1.23.1
Current version
1.23.2
Updates in this version
See the Istio release notes for Istio 1.23.2.

Version 1.22

Version 1.22.3, released 20 August 2024

Review the changes that are included in version 1.22.3 of the managed Istio add-on.

Previous version

1.22.1

Current version

1.22.3

Updates in this version

See the Istio release notes for Istio 1.22.2 and Istio 1.22.3.

Resolves the following CVEs:

For more information, see the Istio security bulletin 2024-005.

Version 1.21.5, released 20 August 2024

Review the changes that are included in version 1.21.5 of the managed Istio add-on.

Previous version

1.21.3

Current version

1.21.5

Updates in this version

See the Istio release notes for Istio 1.21.4 and Istio 1.21.5.

Resolves the following CVEs:

For more information, see the Istio security bulletin 2024-005.

Version 1.20.8, released 20 August 2024

Review the changes that are included in version 1.20.8 of the managed Istio add-on.

Previous version
1.20.7
Current version
1.20.8
Updates in this version
This is the final version of addon-istio 1.20. addon-istio 1.20 is unsupported on 18 September 2024.
See the Istio release notes for Istio 1.20.8.
Resolves the following CVEs:

Version 1.22.4, released 18 August 2024

Review the changes that are included in version 1.22.4 of the managed Istio add-on.

Previous version
1.22.3
Current version
1.22.4
Updates in this version
See the Istio release notes for Istio 1.22.4.
Resolves the following CVEs:

Version 1.22.1, released 21 June 2024

Review the changes that are included in version 1.22.1 of the managed Istio add-on.

Previous version
1.21.3
Current version
1.22.1
Updates in this version
See the Istio release notes for Istio 1.22.0 and Istio 1.22.1.

Unsupported: Version 1.21

Version 1.21 of the managed Istio add-on is unsupported.

Version 1.21.3, released 19 June 2024

Review the changes that are included in version 1.21.3 of the managed Istio add-on.

Previous version

1.21.2

Current version

1.21.3

Updates in this version

See the Istio release notes for Istio 1.21.3.

Resolves the following CVEs:

For more information, see the Istio security bulletin 2024-004

Version 1.20.7, released 19 June 2024

Review the changes that are included in version 1.20.7 of the managed Istio add-on.

Previous version

1.20.6

Current version

1.20.7

Updates in this version

See the Istio release notes for Istio 1.20.7.

Resolves the following CVEs:

For more information, see the Istio security bulletin 2024-004

Version 1.21.2, released 8 May 2024

Review the changes that are included in version 1.21.2 of the managed Istio add-on.

Previous version
1.21.1
Current version
1.21.2
Updates in this version
For more information, see the Istio security bulletin 2024-003.
See the Istio release notes for Istio 1.21.2.
Resolves the following CVEs:
  • USN-6733-1
  • CVE-2024-28835
  • CVE-2024-28834

Version 1.20.6, released 8 May 2024

Review the changes that are included in version 1.20.6 of the managed Istio add-on.

Previous version
1.20.5
Current version
1.20.6
Updates in this version
For more information, see the Istio security bulletin 2024-003.
See the Istio release notes for Istio 1.20.6.
Resolves the following CVEs:
  • USN-6733-1
  • CVE-2024-28835
  • CVE-2024-28834

Version 1.21.1, released 26 April 2024

Review the changes that are included in version 1.21.1 of the managed Istio add-on.

Previous version
1.20.5
Current version
1.21.1
Updates in this version
See the Istio release notes for Istio 1.21.0 and Istio 1.21.1.
Addon-Istio no longer deletes the managed-istio IOP when you disable the add-on. If you choose to disable addon-istio, you can choose between uninstalling or no longer managing Istio. See the Setting up Istio documentation for more information.

Unsupported: Version 1.20

Version 1.20 of the managed Istio add-on is unsupported.

Version 1.20.5, released 24 April 2024

Review the changes that are included in version 1.20.5 of the managed Istio add-on.

Previous version

1.20.4

Current version

1.20.5

Updates in this version

For more information, see the Istio security bulletin 2024-002.

See the Istio release notes for Istio 1.20.5.

Resolves the following CVEs:

Version 1.19.9, released 24 April 2024

Review the changes that are included in version 1.19.9 of the managed Istio add-on.

Previous version
1.19.8
Current version
1.19.9
Updates in this version
This is the final version of addon-istio 1.19. addon-istio 1.19 is unsupported on 08 May 2024.
For more information, see the Istio security bulletin 2024-002.
See the Istio release notes for Istio 1.19.9.
Resolves the following CVEs:

Version 1.20.4, released 03 April 2024

Review the changes that are included in version 1.20.4 of the managed Istio add-on.

Previous version
1.20.3
Current version
1.20.4
Updates in this version
Uninstalling Addon-Istio no longer deletes the istio-system namespace. This cleanup became unnecessary over time.
See the Istio release notes for Istio 1.20.4.
Resolves the following CVEs:

Version 1.19.8, released 03 April 2024

Review the changes that are included in version 1.19.8 of the managed Istio add-on.

Previous version
1.19.7
Current version
1.19.8
Updates in this version
This version is the final version of Addon-Istio 1.19. Addon-Istio 1.19 is unsupported on 8 May 2024.
Uninstalling Addon-Istio no longer deletes the istio-system namespace. This cleanup became unnecessary over time.
See the Istio release notes for Istio 1.19.8.
Resolves the following CVEs:

Version 1.20.3, released 06 March 2024

Review the changes that are included in version 1.20.3 of the managed Istio add-on.

Previous version
1.20.2
Current version
1.20.3
Updates in this version
See the Istio release notes for Istio 1.20.3.
Resolves the following CVEs:

Version 1.19.7, released 06 March 2024

Review the changes that are included in version 1.19.7 of the managed Istio add-on.

Previous version
1.19.6
Current version
1.19.7
Updates in this version
See the Istio release notes for Istio 1.19.7.
Resolves the following CVEs:

Version 1.20.2, released 07 February 2024

Review the changes that are included in version 1.20.2 of the managed Istio add-on.

Previous version
1.20.1
Current version
1.20.2
Updates in this version
For more information, see the Istio 1.20.2 release notes.
Resolves the following CVEs:

Version 1.19.6, released 07 February 2024

Review the changes that are included in version 1.19.6 of the managed Istio add-on.

Previous version
1.19.5
Current version
1.19.6
Updates in this version
See the Istio 1.19.6 release notes.
Resolves the following CVEs:

Version 1.18.7, released 07 February 2024

Review the changes that are included in version 1.18.7 of the managed Istio add-on.

Previous version
1.18.6
Current version
1.18.7
Updates in this version
This version is the EOL version for 1.18. Support for Istio 1.18 ends on 21 February 2024.
See the Istio release notes for Istio 1.18.7.
Resolves the following CVEs:

Version 1.20.1, released 10 January 2024

Review the changes that are included in version 1.20.1 of the managed Istio add-on.

Previous version
1.20.0
Current version
1.20.1
Updates in this version
For more information, see the Istio security bulletin 2023-005.
See the Istio release notes for Istio 1.20.1.
Resolves the following CVEs:

Version 1.19.5, released 10 January 2024

Review the changes that are included in version 1.19.5 of the managed Istio add-on.

Previous version
1.19.4
Current version
1.19.5
Updates in this version
For more information, see the Istio security bulletin 2023-005.
See the Istio release notes for Istio 1.19.5.
Resolves the following CVEs:

Version 1.18.6, released 10 January 2024

Review the changes that are included in version 1.18.6 of the managed Istio add-on.

Previous version
1.18.5
Current version
1.18.6
Updates in this version
See the Istio release notes for Istio 1.18.6.
For more information, see the Istio security bulletin 2023-005.
Resolves the following CVEs:

Version 1.20.0, released 7 December 2023

Review the changes that are included in version 1.20.0 of the managed Istio add-on.

Previous version
1.19.4
Current version
1.20.0
Updates in this version
See the Istio release notes for Istio 1.20.0.

Unsupported: Version 1.19

Version 1.19 of the managed Istio add-on is unsupported.

Version 1.19.4, released 5 December 2023

Review the changes that are included in version 1.19.4 of the managed Istio add-on.

Previous version
1.19.3
Current version
1.19.4
Updates in this version
See the Istio release notes for Istio 1.19.64.
Resolves the following CVEs:

Version 1.18.5, released 18 October 2023

Previous version
1.18.3
Current version
1.18.5
Updates in this version
See the Istio release notes for Istio 1.18.5.
Resolves CVE-2023-44487 and CVE-2023-39325.
For more information, see the Istio security bulletin 2023-004.

Version 1.17.8, released 18 October 2023

Previous version
1.17.6
Current version
1.17.8
Updates in this version
See the Istio release notes for Istio 1.17.8.
Resolves CVE-2023-44487 and CVE-2023-39325.
For more information, see the Istio security bulletin 2023-004

Version 1.19.3, released 10 October 2023

Review the changes that are included in version 1.19.3 of the managed Istio add-on.

Previous version
1.18.3
Current version
1.19.3
Updates in this version
For more information, see the Istio security bulletin 2023-004
See the Istio release notes for Istio 1.19.3.
Upstream announcement for Istio 1.19.0.
Addon-Istio does not support ambient mesh at this time

Unsupported: Version 1.18

Version 1.18 of the managed Istio add-on is unsupported.

Version 1.18.3, released 3 October 2023

Review the changes that are included in version 1.18.3 of the managed Istio add-on.

Previous version
1.18.2
Current version
1.18.3
Updates in this version
See the Istio release notes for Istio 1.18.3.
Resolves the following CVEs:

Version 1.17.6, released 3 October 2023

Review the changes that are included in version 1.17.6 of the managed Istio add-on.

Previous version
1.17.6
Current version
1.17.5
Updates in this version
See the Istio release notes for Istio 1.17.6.
Resolves the following CVEs:

Version 1.18.2, released 8 August 2023

Review the changes that are included in version 1.18.2 of the managed Istio add-on.

Previous version
1.18.1
Current version
1.18.2
Updates in this version
See the Istio release notes for Istio 1.18.2.
For more information, see the Istio security bulletin 2023-003.

Version 1.17.5, released 8 August 2023

Review the changes that are included in version 1.17.5 of the managed Istio add-on.

Previous version
1.17.4
Current version
1.17.5
Updates in this version
See the Istio release notes for Istio 1.17.5.
For more information, see the Istio security bulletin 2023-003.

Version 1.16.7, released 8 August 2023

Review the changes that are included in version 1.16.7 of the managed Istio add-on.

Previous version
1.16.6
Current version
1.16.7
Updates in this version
See the Istio release notes for Istio 1.16.7.
For more information, see the Istio security bulletin 2023-003.

Version 1.18.1, released 27 July 2023

Review the changes that are included in version 1.18.1 of the managed Istio add-on. For more information, see the Istio security bulletin 2023-002.

Previous version
1.18.0
Current version
1.18.1
Updates in this version
See the Istio release notes for Istio 1.18.1.
Resolves the following CVEs:

Version 1.17.4, released 27 July 2023

Review the changes that are included in version 1.17.4 of the managed Istio add-on. For more information, see the Istio security bulletin 2023-002.

Previous version
1.17.3
Current version
1.17.4
Updates in this version
See the Istio release notes for Istio 1.17.4.
Resolves the following CVEs:

Version 1.16.6, released 27 July 2023

Review the changes that are included in version 1.16.6 of the managed Istio add-on. For more information, see the Istio security bulletin 2023-002.

Previous version
1.16.5
Current version
1.16.6
Updates in this version
See the Istio release notes for Istio 1.16.6.
Resolves the following CVEs:

Version 1.18.0, released 12 July 2023

Review the changes that are included in version 1.18.0 of the managed Istio add-on.

Previous version
1.17.3
Current version
1.18.0
Updates in this version
See the Istio release notes for Istio 1.18.0.
Adds an enable-targeted-envoy-access-log Envoy extension provider to the mesh config. You can use Telemetry CRs to enable Envoy access logs on specific workloads rather than enabling it for the entire mesh. For more information, see Observing Istio traffic.
Protocol sniffing is now enabled for Addon-Istio.
Addon-Istio pods now have a nodeAffinity for amd64 architecture nodes.
Adjusts how meshConfig sets enableAutoMtls, enableTracing, and protocolDetectionTimeout to their current values. This results in a no operation change because the values are not changing. The only change is whether they are set implicitly or explicitly.
Sets the security context explicitly in the Istio Operator CR. This results in a no operation change because the values are not changing. The only change is whether they are set implicitly or explicitly.
Resolves the following CVEs:

Unsupported: Version 1.17

Version 1.17 of the managed Istio add-on is unsupported.