Authorization Bypass in Consul Connect Service Mesh by HashiCorp
CVE-2026-88021

7.5HIGH

Key Information:

Vendor

Hashicorp
Status
Consul
Consul Enterprise
Vendor
CVE Published:
10 September 2026

What is CVE-2026-88021?

Consul and Consul Enterprise are affected by an authorization bypass vulnerability in the Connect service mesh. This issue arises from improper character handling in service names, namespaces, and partitions while establishing Envoy RBAC rules. As a result, the authorization rules generated may match broader criteria than intended, potentially allowing unauthorized services to access restricted resources. The vulnerability has been addressed in the latest versions of Consul, specifically 2.0.4 and in Consul Enterprise versions 1.21.18, 1.22.12, and 2.0.4.

Affected Version(s)

Consul 64 bit 1.9.0 < 2.0.4

Consul Enterprise 64 bit 1.9.0 < 2.0.4

References

https://discuss.hashicorp.com/t/hcsec-2026-37-consul-vuln...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was reported to HashiCorp by Đoàn Thành.
.