Consul vulnerable to an authorization bypass in the agent's service mesh leaf certificate API

Summary

HashiCorp Consul and Consul Enterprise 1.17.0 up to 2.0.4 are vulnerable to an authorization bypass in the agent's service mesh leaf certificate API that may allow an attacker without a valid ACL token to retrieve a cached service leaf certificate and its private key. This vulnerability (CVE-2026-105765) is fixed in Consul Community Edition 2.1.0 and Consul Enterprise 2.1.0 and 1.21.19.

Remediation

1. Inventory every HashiCorp Consul deployment, including staging.
2. Upgrade HashiCorp Consul to 2.1.0.
3. Confirm the running version after the upgrade.

References

• Referencehttps://discuss.hashicorp.com/t/hcsec-2026-46-consul-vulnerable-to-an-authorization-bypass-in-the-agents-service-mesh-leaf-certificate-api/77911