CVE-2026-87106

Consul vulnerable to a denial of service in the native RPC listener

State: Published
Severity: 6.5 Medium
Published: Sep 10, 2026
Updated: Sep 10, 2026
Reserved: Sep 8, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	HashiCorp

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
ConsulHashiCorp	1.21.0 to before 2.0.4Affected
Consul EnterpriseHashiCorp	1.21.0 to before 2.0.4Affectedfrom 1.21.18Not affectedfrom 1.22.12Not affected

References

https://discuss.hashicorp.com/t/hcsec-2026-35-consul-vulnerable-to-a-denial-of-service-in-the-native-rpc-listener/77737

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