Emergency Out-of-Band Release 1.23.3

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Adolfo Veytia

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Jan 24, 2022, 9:57:36 PM1/24/22
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Hey Kubefolx,


A regression in the handling of custom resource data was reported last week[1] that impacts Kubernetes versions 1.23.0-1.23.2.

In the affected Kubernetes versions, Custom Resource Definitions that specify x-kubernetes-preserve-unknown-fields: true on fields containing list items and do not set it on the individual items schema, incorrectly drop unknown fields inside those list items. The issue has been fixed[2] and will be resolved in 1.23.3, which is targeted to be released tomorrow (2022-01-25).


If you use Custom Resource Definitions that make use of the x-kubernetes-preserve-unknown-fields: true feature for list fields, we recommend you wait to upgrade until 1.23.3+ and avoid the following releases:

  • 1.23.0
  • 1.23.1
  • 1.23.2


If upgrading to 1.23.3+ is not possible, the issue can also be mitigated by changing the Custom Resource Definition schema to set x-kubernetes-preserve-unknown-fields: true on the items schema instead of (or in addition to) the parent property schema to continue preserving unknown fields inside the individual items.


Many Thanks, 

SIG Release


[1] https://github.com/kubernetes/kubernetes/issues/107690
[2] https://github.com/kubernetes/kubernetes/pull/107688



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