Security Bulletin
Summary
HashiCorp Consul and Consul Enterprise are vulnerable to an authorization bypass in health check registration that may allow an authenticated user to modify health checks belonging to another service on the same node. This vulnerability (CVE-2026-115804) is fixed in Consul Community Edition 2.1.0 and Consul Enterprise 2.1.0 and 1.21.19.
Vulnerability Details
CVEID: CVE-2026-115804
DESCRIPTION: Consul did not consistently authorize changes to an existing health check against the service to which the check was already bound. An authenticated user with service:write permission for a different service registered on the same node could modify or rebind a check belonging to a service they were not authorized to modify. This may alter the affected service's reported health and influence whether its instances are included in service discovery or mesh routing. This issue requires ACLs to be enabled and the ability to write to a separate service on the same node.
CWE: CWE-639: Authorization Bypass Through User-Controlled Key
CVSS Source: HashiCorp Inc.
CVSS Base score: 6.4
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Consul Community Edition | affected from 0.7.2 up to 2.1.0 |
| Consul Enterprise | affected from 0.7.2 up to 2.1.0, unaffected from 1.21.19 |
Remediation/Fixes
Customers should evaluate the risk associated with this issue and consider upgrading to Consul Community Edition 2.1.0 or Consul Enterprise 2.1.0 or 1.21.19.
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References
Acknowledgement
This issue was reported to HashiCorp by Immad Sahin of ZeroTrail.
Change History
26 Oct 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
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Document Location
Worldwide
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Document Information
Modified date:
26 October 2026
Initial Publish date:
26 October 2026
UID
ibm17294122