CVE-2026-88021
CVE-2026-88021 · Consul vulnerable to an authorization bypass in the Connect service mesh
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.5 · High · EPSS 0.3% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
consul
- Versions
- ≥ 1.9.0, < 2.0.4: Affected (semver)
Update to 2.0.4
consul enterprise
- Versions
- ≥ 1.9.0, < 2.0.4: Affected; ≥ 1.21.18: Not affected; ≥ 1.22.12: Not affected (semver)
Update to 1.21.18
consul Ubuntu:18.04:LTS
- Versions
- 0.6.4~dfsg-3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
consul Ubuntu:20.04:LTS
- Versions
- 1.0.7~dfsg1-5ubuntu1
- 1.4.4~dfsg1-2ubuntu2
- 1.5.2+dfsg1-6
- 1.5.2+dfsg1-10
- 1.5.2+dfsg1-12
- 1.5.2+dfsg2-14
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
consul Ubuntu:22.04:LTS
- Versions
- 1.7.4+dfsg1-1
- 1.8.7+dfsg1-3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published