CVE-2026-87090: Hashicorp Consul

High severity, CVSS 8.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Hashicorp Consul: from 0.1.0, before 2.0.4 (fixed in 2.0.4)
• Hashicorp Consul Enterprise: from 0.1.0, before 2.0.4 (fixed in 2.0.4)

Published 2026-09-10. Last modified 2026-09-10.