Consul 1.13.0-2.0.2 Unauthenticated DoS via Unbounded gRPC Listener
CVE-2026-15972 Published on August 7, 2026
Unauthenticated denial of service via unbounded external gRPC connection acceptance
Consul Community Edition and Consul Enterprise 1.13.0 through 2.0.2 are vulnerable to an unauthenticated denial of service through unbounded connection acceptance on the external gRPC listeners. A remote attacker may exhaust agent file descriptors, goroutines, and memory by opening many incomplete connections, potentially preventing legitimate clients from connecting. This vulnerability, CVE-2026-15972, is fixed in Consul 2.0.3 and Consul Enterprise 1.21.17, 1.22.11, and 2.0.3.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-15972
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Affected Versions
HashiCorp Consul:- Version 1.13.0 and below 2.0.3 is affected.
- Version 1.13.0 and below 2.0.3 is affected.