Announcing Istio 1.27.4

Istio 1.27.4 patch release.

Dec 3, 2025

This release contains bug fixes to improve robustness. This release note describes what’s different between Istio 1.27.3 and 1.27.4.

This release implements the security updates described in our 3rd of December post, ISTIO-SECURITY-2025-003.

Things to know and prepare before upgrading.

Download and install this release.

Visit the documentation for this release.

Inspect the full set of source code changes.

Changes

Fixed status conflicts on Route resources when multiple istio revisions are installed. (Issue #57734)
Fixed an issue with waypoints where an EnvoyFilter with targetRef kind GatewayClass and group gateway.networking.k8s.io in the root namespace would not work.
Fixed a failure in istio-init when using native nftables with TPROXY mode and had an empty traffic.sidecar.istio.io/includeInboundPorts annotation. (Issue #58135)
Fixed an issue where Envoy Secret resources could get stuck in WARMING state when the same Kubernetes Secret is referenced from Istio Gateway objects using both secret-name and namespace/secret-name formats. (Issue #58146)
Fixed DNS name table creation for headless services where pods entries did not account for pods having multiple IPs. (Issue #58397)
Fixed an issue where HTTPS servers processed first prevented HTTP servers from creating routes on the same port with different bind addresses. (Issue #57706)
Fixed a bug causing the experimental XListenerSet resources to not be able to access TLS Secrets.