Releases

AI-analyzed release notes for CNCF graduated and incubating projects.

URGENCY

All Action needed Check if affected Plan ahead

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All AI & ML CI/CD & App Delivery Kubernetes Core Networking & Messaging Observability Orchestration & Management Provisioning & Runtime Security Storage & Data

Project: CiliumClear ×

Ciliumv1.20.0Networking & MessagingJul 29, 2026

ACTION 11CHECK 28PLAN 6OTHER 478View full analysis

A substantial feature and maintenance release with Gateway API, networking, IPAM, policy, observability, and datapath changes, alongside correctness and performance fixes. Operators should review removed or renamed options, changed defaults and requirements, removed metrics and integrations, and the dependency updates addressing security-related issues.

Action needed (11)

securitygoogle.golang.org/grpc v1.79.3
The google.golang.org/grpc module is updated to v1.79.3 in the main branch.
securitygoogle.golang.org/grpc v1.82.1
The google.golang.org/grpc module is updated to v1.82.1 in the v1.20 branch.
securityhelm.sh/helm/v4 v4.1.4
The helm.sh/helm/v4 module is updated to v4.1.4 in the main branch.
securitygithub.com/cloudflare/circl v1.6.3
The github.com/cloudflare/circl module is updated to v1.6.3.
securitygithub.com/go-jose/go-jose/v4 v4.1.4
The github.com/go-jose/go-jose/v4 module is updated to v4.1.4.
securitygithub.com/moby/spdystream v0.5.1
The github.com/moby/spdystream module is updated to v0.5.1.
breakingcni.customConf CNI configuration version
The default CNI configuration version for cni.customConf changes from 0.3.1 to 1.0.0.
breakingCilium operator IPAM metrics removal
The IPAM metrics cilium_operator_ipam_ips and cilium_operator_ipam_available_interfaces are removed.
breakingDefault CNI configuration version
The default CNI configuration version changes from 0.3.1 to 1.0.0.
breakingNative histogram default
Native histograms are emitted for all histograms by default.
breakingAgent bootstrap metrics removal
Agent bootstrap metrics are removed.

Check if affected (28)

securitytbid traffic host namespace handling
Applies if you use tbid traffic.
Explicit tbid traffic is prevented from leaking to the host network namespace.
breakingDocker libnetwork plugin removal
Applies if you use the Docker libnetwork plugin.
The Docker libnetwork plugin is sunset and is no longer available in this release.
breakingces-slice-mode removal
Applies if you configure ces-slice-mode.
The deprecated ces-slice-mode option is removed in this release.
+ 25 more on the release page

Plan ahead (6)

deprecatedBeta Mutual Auth deprecationremoval date not announced
Applies if you use Mutual Auth.
Cilium's Beta Mutual Auth support is deprecated and will be removed in a future version.
deprecatedDeprecated address and interface CIDR fields
Applies if you configure addresses[].subnet or interfaces[].cidr.
The previous per-address addresses[].subnet and flat interfaces[].cidr fields are deprecated.
deprecatedLocal REST BGP API deprecationremoval date not announced
Applies if you use the local REST BGP APIs.
The local REST BGP APIs are deprecated and will be removed in the future.
+ 3 more on the release page

Source ↗

Ciliumv1.19.0Networking & MessagingFeb 4, 2026

ACTION 15CHECK 30PLAN 7OTHER 436View full analysis

A substantial operator-facing feature and maintenance release with new DNS proxy, installation, configuration, API, metric, and datapath capabilities. It also changes defaults and compatibility requirements, removes deprecated interfaces, migrates BGP APIs, and updates security-related dependencies.

Action needed (15)

securityThe github.com/containerd/containerd dependency, updated
The github.com/containerd/containerd module is updated to v1.7.29.
securityThe github.com/go-viper/mapstructure/v2 dependency, updated
The github.com/go-viper/mapstructure/v2 module is updated to v2.4.0.
securityThe github.com/docker/docker dependency, updated
The github.com/docker/docker module is updated to v28.3.3+incompatible.
securityThe golang.org/x/crypto dependency, updated
The golang.org/x/crypto module is updated to v0.45.0.
securityThe helm.sh/helm/v3 dependency, updated to v3.18.4
The helm.sh/helm/v3 module is updated to v3.18.4.
securityThe helm.sh/helm/v3 dependency, updated to v3.18.5
The helm.sh/helm/v3 module is updated to v3.18.5.
breakingThe plpmtud default, set to blackhole
The default plpmtud mode is now blackhole (blackhole-detected).
breakingThe AddressScopeMax default, set to 254
The default AddressScopeMax is changed to 254, the host scope, for GKE metadata server and HCP use cases. The related setting is --local-max-addr-scope.
breakingThe tls authMode default, set to migration
tls authMode is set to migration by default.
breakingThe CNI deletion timeout, reduced to 1.5 seconds
The CNI deletion timeout is reduced to 1.5 seconds.
breakingThe policy-default-local-cluster default
policy-default-local-cluster is now set by default.
breakingHost firewall bypass, disabled by default
Host firewall bypass is disabled by default.
breakingFQDN match pattern sanitization
FQDN match pattern sanitization is refactored and tightened.
breakingEncrypted traffic forwarding via cilium_host, removed
Forwarding encrypted traffic via cilium_host has been removed.
breakingCNI configuration in the container image, removed
The CNI configuration is no longer installed in the container image.

Check if affected (30)

breakingLocal-cluster default for network policy selectors
Applies if you do not set cluster in network policy selectors.
Network policy selectors without an explicit cluster now allow communication only with the local cluster by default.
breakingThe CiliumBGPPeeringPolicy v1 API, removed
Applies if you use CiliumBGPPeeringPolicy.
Support for the older CiliumBGPPeeringPolicy v1 API is removed. BGP configuration uses the cilium.io/v2 APIs instead.
breakingMutual Authentication, disabled by default
Applies if you enable Mutual Authentication.
The out-of-band Mutual Authentication feature is disabled by default pending community feedback.
+ 27 more on the release page

Plan ahead (7)

deprecated--enable-ipsec-encrypted-overlay, deprecatedremoval date not announced
Applies if you use --enable-ipsec-encrypted-overlay.
The special IPsec mode for enabling encrypted overlay with Multicast, configured by --enable-ipsec-encrypted-overlay, is deprecated and will be removed in a future release.
deprecatedKafka match fields and ToRequires and FromRequires, deprecated
Applies if you use ToRequires or FromRequires.
Kafka protocol match fields (beta), along with the ToRequires and FromRequires policy fields, are deprecated.
deprecatedTLS certificate and key Helm values, deprecated
Applies if you pass TLS certificates or keys in Helm values.
Passing TLS certificates and keys in Helm values is deprecated.
+ 4 more on the release page

Source ↗

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