Security Bulletin
Summary
Consul and Consul Enterprise are vulnerable to an authorization bypass in the catalog deregistration path that may allow a local ACL token to delete peer-imported catalog objects. A caller with service:write or node:write permission may exploit this issue to remove services, checks, or nodes imported from a peered cluster without holding authority over the peer origin. This vulnerability (CVE-2026-87107) is fixed in Consul 2.0.4 and Consul Enterprise 1.21.18, 1.22.12 and 2.0.4.
Vulnerability Details
CVEID: CVE-2026-87107
DESCRIPTION: The catalog deregistration endpoint did not fully enforce the ownership boundary between locally registered catalog objects and objects imported through cluster peering. A caller with limited write access could submit a crafted deregistration request that affected peer-imported catalog data outside the scope of their local authorization. This could result in peer-imported services, health checks, or nodes being removed from the importing cluster's catalog, potentially disrupting service discovery and routing. The exporting cluster's authoritative state is not modified, and affected data may be restored after a subsequent replication update. Exploiting this issue requires an active cluster peering relationship and a local ACL token with write access to catalog resources. Deployments that do not use Consul cluster peering are not affected.
CWE: CWE-863: Incorrect Authorization
CVSS Source: HashiCorp Inc.
CVSS Base score: 5.4
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Consul Community Edition | affected from 1.21.0 up to 2.0.4 |
| Consul Enterprise | affected from 1.21.0 up to 2.0.4, unaffected from 1.21.18, 1.22.12 |
Remediation/Fixes
Customers should evaluate the risk associated with this issue and consider upgrading to Consul 2.0.4 or Consul Enterprise 1.21.18, 1.22.12, or 2.0.4.
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References
Acknowledgement
This issue was reported to HashiCorp by Yazdan Soltani.
Change History
10 Sep 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:
10 September 2026
Initial Publish date:
10 September 2026
UID
ibm17287035