High severity · published Oct 26, 2026
CVE-2026-105608
Consul vulnerable to an authorization bypass in service mesh registration
New
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
HashiCorp Consul and Consul Enterprise are vulnerable to an authorization bypass in service mesh proxy registration. This may allow a user with service write permission to apply Envoy escape-hatch configuration without the required mesh write permission. This vulnerability (CVE-2026-105608) is fixed in Consul Community Edition 2.1.0 and Consul Enterprise 2.1.0 and 1.21.19.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
Consul · HashiCorp
2.0.4 before 2.1.0 · source: vendor
CE
Consul Enterprise · HashiCorp
2.0.4 before 2.1.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105608
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-105608
discuss.hashicorp.com
https://discuss.hashicorp.com/t/hcsec-2026-47-consul-vulnerable-to-an-authorization-bypass-in-service-mesh-registration/77912
More from Consul
8.8
CVE-2021-41805
HashiCorp Consul Enterprise before 1.8.17, 1.9.x before 1.9.11, and 1.10.x before 1.10.4 has Incorrect Access Control
8.8
CVE-2021-37219
HashiCorp Consul and Consul Enterprise 1.10.1 Raft RPC layer allows non-server agents with a valid certificate signed by the same CA to access server-only functionality, enabling…
8.6
CVE-2021-3121
An issue was discovered in GoGo Protobuf before 1.3.2
8.3
CVE-2026-87090
Consul vulnerable to an authorization bypass in the catalog node-write path
8.1
CVE-2023-5332
Patch in third party library Consul requires 'enable-script-checks' to be set to False