CVE-2026-87106: Hashicorp Consul

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Hashicorp Consul: from 1.21.0, before 2.0.4 (fixed in 2.0.4)
• Hashicorp Consul Enterprise: from 1.21.0, before 2.0.4 (fixed in 2.0.4)

Published 2026-09-10. Last modified 2026-09-10.