Service Mesh

HashiCorp Consul Releases

Track HashiCorp Consul releases, service mesh evolution, Kubernetes integration, version feature comparison, and Envoy dataplane alignment.

Official Site Documentation

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Total Versions

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Supported

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Latest

Version Timeline

All tracked releases with lifecycle status and EOL dates.

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Lifecycle Timeline

Visual overview of active support and maintenance windows.

1.15

1.16

1.17

1.18

1.19

1.20

2023 2024 2025 2026 2027 2028

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Maintenance

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Upgrade Paths

Migration guidance between major versions — breaking changes, effort estimates, and tips.

1.15/1.16 1.19+ Medium Difficulty

Est. 1-2 hours per minor version

Breaking Changes

BSL license change (1.17+)
Consul Dataplane recommended over client agents
Deprecated API endpoints removed
Connect proxy configuration format changes
ACL token format updates
Envoy version requirements bumped

Migration Notes

Upgrade one minor at a time. The shift from client agents to Dataplane (1.16+) is optional but recommended for Kubernetes. Server upgrades: snapshot first, upgrade followers, then leader. If moving to Dataplane, plan a separate migration window. Client agent mode continues to work.

1.18/1.19 1.20 Low Difficulty

Est. 30-60 minutes

Breaking Changes

Updated default ACL behavior
Envoy proxy version requirements updated
Minor API deprecations

Migration Notes

Take a snapshot, upgrade servers (followers first), upgrade clients/dataplanes. Verify service mesh connectivity and health checks after upgrade. Standard rolling upgrade procedure.

Version Risk Assessment

Evaluate risk factors before choosing a version for production.

Version	EOL Risk	CVE Risk	Ecosystem	Cloud Support	Overall	Recommended Action
HashiCorp Consul 1.15 and older	Critical	High	Unsupported	None	Critical	No patches — upgrade immediately
HashiCorp Consul 1.16/1.17	Critical	Medium	Unsupported	Degrading	Critical	Past EOL — upgrade to 1.19+
HashiCorp Consul 1.18	Medium	Low	Maintenance	Full	Medium	Security-only — plan upgrade
HashiCorp Consul 1.19	Low	Low	Active	Full	Low	Supported — keep patched
HashiCorp Consul 1.20	None	Low	Active	Full	Low	Latest — recommended

Consul patches the latest 3 minor versions. As a service mesh and discovery tool, running unsupported versions risks service routing failures and security gaps. Assessed March 2026.

Consul Version Feature Comparison

Side-by-side feature differences across major versions.

Feature	1.15	1.16	1.17	1.18	1.19
Consul Dataplane	Beta	Stable	Default	Default	Enhanced
Service mesh (Connect)	Stable	Stable	Enhanced	Enhanced	Enhanced
Envoy version	1.25	1.27	1.28	1.30	1.31
Cluster peering	Stable	Stable	Enhanced	Enhanced	Enhanced
API Gateway	Beta	Stable	Stable	Enhanced	Enhanced
Transparent proxy	Stable	Stable	Enhanced	Enhanced	Enhanced
ACL improvements	Stable	Improved	Improved	Enhanced	Enhanced
Multi-datacenter	Stable	Stable	Stable	Stable	Enhanced
License	MPL 2.0	MPL 2.0	BSL 1.1	BSL 1.1	BSL 1.1

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Health Status

Overall support health

![HashiCorp Consul Health Status](https://img.releaserun.com/badge/health/consul.svg)

EOL Countdown

Next end-of-life date

![HashiCorp Consul EOL Countdown](https://img.releaserun.com/badge/eol/consul.svg)

Latest Version

Current stable release

![HashiCorp Consul Latest Version](https://img.releaserun.com/badge/v/consul.svg)

CVE Status

Known vulnerabilities

![HashiCorp Consul CVE Status](https://img.releaserun.com/badge/cve/consul.svg)

Frequently Asked Questions

Common questions about HashiCorp Consul releases and lifecycle.

What is Consul used for?

Consul serves three purposes: service discovery (find services by name), service mesh (encrypted service-to-service communication via sidecar proxies), and KV store (distributed configuration). Most teams start with service discovery and add mesh capabilities as needed. Consul works across VMs, containers, and Kubernetes.

What changed with Consul's license?

Like Vault, Consul was relicensed from MPL 2.0 to BSL 1.1 in August 2023. Usage for internal business purposes is permitted; offering Consul as a managed service to others is not. The community response was less intense than for Vault/Terraform since Consul has fewer direct competitors in the hosted service space.

How does Consul compare to Istio?

Both provide service mesh capabilities but with different architectures. Consul is platform-agnostic (VMs, K8s, multi-cloud) and uses its own control plane with Envoy sidecars. Istio is Kubernetes-native and uses Envoy with its own xDS control plane. Consul is better for hybrid environments (VMs + K8s). Istio is better for pure Kubernetes deployments. Consul also includes service discovery and KV, which Istio does not.

What is Consul Dataplane?

Consul Dataplane (introduced in 1.14) replaces the per-pod consul-client agent with a lightweight control plane that manages Envoy proxies directly. This reduces resource overhead significantly (no more DaemonSet of Consul clients). It is the recommended architecture for Kubernetes deployments since Consul 1.16+.

How do I upgrade Consul safely?

Consul requires careful upgrades in HA clusters: upgrade server nodes one at a time (followers first, leader last), then upgrade client agents. Never skip major versions. Take a snapshot before upgrading (consul snapshot save). The biggest risk is Raft protocol version mismatches between old and new servers. Read the specific version upgrade guide.

Should I use Consul or just DNS-based service discovery?

DNS works fine for simple setups. Consul adds health checking (only route to healthy instances), service segmentation (mTLS between services), multi-datacenter awareness, and a KV store. If you have fewer than 10 services and do not need mTLS, DNS is simpler. Beyond that, Consul (or a similar tool) prevents cascading failures.

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