CVE-2026-88021
High
Description
Consul and Consul Enterprise are vulnerable to an authorization bypass in the Connect service mesh that may allow a service to reach a destination it is not authorized to access. When building Envoy RBAC rules to enforce Connect intentions, Consul did not correctly escape certain characters in service names, namespaces, and partitions, causing the generated authorization rules to match more broadly than intended. This vulnerability (CVE-2026-88021) is fixed in Consul 2.0.4 and Consul Enterprise 1.21.18, 1.22.12 and 2.0.4.
SeverityHigh
CVSS7.1
Exploit probability—
ProductConsul
PublishedSep 10, 2026
First seenSep 10, 2026
Weakness typeCWE-185CWE-185
How to fix
Update
- HashiCorp Consul2.0.4 or later
- HashiCorp Consul Enterprise2.0.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| HashiCorp Consul | 1.9.0 ≤ v < 2.0.4 | 2.0.4 |
| HashiCorp Consul Enterprise | 1.9.0 ≤ v < 2.0.4 | 2.0.4 |
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