CVE-2026-105608 HashiCorp Consul - Authorization Bypass

HashiCorp Consul and Consul Enterprise < 2.1.0 contain an authorization bypass caused by improper permission checks in service mesh proxy registration, letting users with service write permission apply Envoy escape-hatch configuration without mesh write permission, exploit requires service write permission.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
26 October 2026
Updated
27 October 2026
Weakness
CWE-178

Vendor fix

Update to Consul Community Edition 2.1.0, Consul Enterprise 2.1.0 or 1.21.19.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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