What is CVE-2026-87106?

CVE-2026-87106 is a medium-severity vulnerability in Hashicorp Consul, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-09-10.

How severe is CVE-2026-87106?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Hashicorp Consul

CVE-2026-87106

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.

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

security@hashicorp.com

Frequently asked questions

What is CVE-2026-87106?: CVE-2026-87106 is a medium-severity vulnerability in Hashicorp Consul, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-09-10.
How severe is CVE-2026-87106?: Medium severity. CVSS v3 base score is 6.5 out of 10.