CVE-2026-88021
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.
Scoring
- Severity
- HIGH
- CVSS base score
- 7.5
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
- CWE
- CWE-185
- Published
- 2026-09-10
- Last modified
- 2026-09-10
Affected products
- HashiCorp Consul
- HashiCorp Consul Enterprise
Weakness type
Related vulnerabilities
- CVE-2026-73425 — @astrojs/netlify generates an overly-broad Netlify Image CDN allowlist because remotePatterns.pathname metacharacters are not escaped
- CVE-2026-64655 — GitHub CLI: Attestation Verification Bypass via Unescaped Regex Metacharacters in SAN Matching
- CVE-2026-45065 — Symfony: UrlGenerator Route-Requirement Bypass via Unanchored Regex Alternation → Off-Site //host URL Injection
- CVE-2026-56021 — Webmin information disclosure via regex pattern
- CVE-2026-47674 — Hono: IP Restriction bypasses static deny rules for non-canonical IPv6
- CVE-2026-48147 — Budibase: Unanchored Regex in `matchers.ts` Allows CSRF Bypass via Query String Injection in Budibase Worker
- CVE-2026-4296 — Incorrect Regular Expression vulnerability in GitHub Enterprise Server allowed unauthorized access to user accounts via OAuth callback URL validation bypass
- CVE-2026-25542 — Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching