CVE-2026-88021

EUVD-2026-75700

10.09.2026, 19:17

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
HashiCorp	CNA	7.1 HIGH	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: 25.77%

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
hashicorp	consul	1.9.0 ≤ 𝑥 < 2.0.4	CNA

Ubuntu Releases

Ubuntu Product

Codename

consul

bionic	needs-triage
focal	needs-triage
jammy	needs-triage
noble	dne
resolute	dne

Common Weakness Enumeration

CWE-185 - Incorrect Regular Expression
The software specifies a regular expression in a way that causes data to be improperly matched or compared.

References

https://discuss.hashicorp.com/t/hcsec-2026-37-consul-vulnerable-to-an-authorization-bypass-in-the-connect-service-mesh/77739