1.21.4-asm.0 is now available for in-cluster Cloud Service Mesh
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## Security
**1.21.4-asm.0 is now available for in-cluster Cloud Service Mesh.**
This patch release contains the fix for a security vulnerability where the [Datadog tracer does not handle trace headers with unicode characters](https://github.com/envoyproxy/envoy/security/advisories/GHSA-8mq4-c2v5-3h39). For details on upgrading Cloud Service Mesh, refer to [Upgrade Cloud Service Mesh](https://cloud.google.com/service-mesh/docs/upgrade/upgrade). Cloud Service Mesh v1.21.4-asm.0 uses Envoy v1.29.6.