Authorization Bypass in HashiCorp Consul and Consul Enterprise
CVE-2026-105608

8.8HIGH

Key Information:

Vendor

Hashicorp
Status
Consul
Consul Enterprise
Vendor
CVE Published:
26 October 2026

What is CVE-2026-105608?

HashiCorp Consul and Consul Enterprise are prone to an authorization bypass vulnerability in their service mesh proxy registration feature. This flaw could enable a user with service write permissions to configure Envoy escape-hatch settings without having the necessary mesh write permissions. As a result, unauthorized actions may be executed within the service mesh environment, potentially compromising security protocols. This issue has been addressed in the subsequent releases of Consul Community Edition 2.1.0 and Consul Enterprise versions 2.1.0 and 1.21.19.

Affected Version(s)

Consul 64 bit 2.0.4 < 2.1.0

Consul Enterprise 64 bit 2.0.4 < 2.1.0

References

https://discuss.hashicorp.com/t/hcsec-2026-47-consul-vuln...

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
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 Immad Sahin of ZeroTrail and Yonghwa Lee of Theori.
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