CVE-2026-87090

Consul vulnerable to an authorization bypass in the catalog node-write path

State: Published
Severity: 8.3 High
Published: Sep 10, 2026
Updated: Sep 10, 2026
Reserved: Sep 8, 2026

Description

Consul and Consul Enterprise are vulnerable to an authorization bypass in the catalog node-write path that may allow an authenticated attacker to delete another node's catalog registration and take over its node identity. An attacker with a token granting node-write permission on any single node name may exploit this issue if they can obtain the node ID of a node they do not control. This vulnerability (CVE-2026-87090) is fixed in Consul 2.0.4 and Consul Enterprise 1.21.18, 1.22.12 and 2.0.4.

Scores

CVSS	Score	Vector	Source
3.1	8.3 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H	HashiCorp

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
ConsulHashiCorp	0.1.0 to before 2.0.4Affected
Consul EnterpriseHashiCorp	0.1.0 to before 2.0.4Affectedfrom 1.21.18Not affectedfrom 1.22.12Not affected

References

https://discuss.hashicorp.com/t/hcsec-2026-34-consul-vulnerable-to-an-authorization-bypass-in-the-catalog-node-write-path/77736

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