What’s Vulnerable › Vulnerabilities
CVE-2026-87106: Consul vulnerable to a denial of service in the native RPC listener
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-10 · updated 2026-09-10
- Weakness: CWE-400
Description
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
How to fix
Upgrade to a fixed version: HashiCorp Consul 2.0.4; HashiCorp Consul Enterprise 2.0.4. Check the vendor advisory for mitigations.
References
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