CVE-2026-88021

Consul vulnerable to an authorization bypass in the Connect service mesh

Published Sep 10, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Hashicorp
Hashicorp consul
Hashicorp consul Enterprise
Vendors & Products Hashicorp
Hashicorp consul
Hashicorp consul Enterprise
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Consul vulnerable to an authorization bypass in the Connect service mesh
Weaknesses CWE-185
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
HashiCorp
Published
Updated
Oct 2, 2026, 2:12 PM
Reserved
Sep 9, 2026, 7:40 PM
Status
Awaiting Analysis
Published
Sep 10, 2026, 7:17 PM
Modified
Sep 10, 2026, 8:17 PM