What’s Vulnerable › Vulnerabilities
CVE-2026-15972: Unauthenticated denial of service via unbounded external gRPC connection acceptance
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-07 · updated 2026-08-28
- Weakness: CWE-770
Description
Consul Community Edition and Consul Enterprise 1.13.0 through 2.0.2 are vulnerable to an unauthenticated denial of service through unbounded connection acceptance on the external gRPC listeners. A remote attacker may exhaust agent file descriptors, goroutines, and memory by opening many incomplete connections, potentially preventing legitimate clients from connecting. This vulnerability, CVE-2026-15972, is fixed in Consul 2.0.3 and Consul Enterprise 1.21.17, 1.22.11, and 2.0.3.
Affected products
- HashiCorp Consul: from 1.13.0 before 2.0.3 — fixed in 2.0.3
- HashiCorp Consul Enterprise: from 1.13.0 before 2.0.3 — fixed in 2.0.3
How to fix
Upgrade to a fixed version: HashiCorp Consul 2.0.3; HashiCorp Consul Enterprise 2.0.3. Check the vendor advisory for mitigations.
References
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