Consul RPC Listener DoS via auth mem exhaustion pre-2.0.4
CVE-2026-87106 Published on September 10, 2026
Consul vulnerable to a denial of service in the native RPC listener
Consul and Consul Enterprise are vulnerable to a denial of service in the native RPC listener that may allow an authenticated client to exhaust server memory before ACL authorization is evaluated. A client that can complete the internal RPC mTLS handshake may exploit this issue without holding a valid ACL token. This vulnerability (CVE-2026-87106) is fixed in Consul 2.0.4 and Consul Enterprise 1.21.18, 1.22.12 and 2.0.4.
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-87106 has been classified to as a Resource Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-87106
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Affected Versions
HashiCorp Consul:- Version 1.21.0 and below 2.0.4 is affected.
- Version 1.21.0 and below 2.0.4 is affected.