CVE-2026-15972 — Unauthenticated denial of service via unbounded external gRPC connection acceptance

Description (CNA)

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 (CNA)

Vendor / product	Versions
HashiCorp / Consul	affected 1.13.0 before 2.0.3
HashiCorp / Consul Enterprise	affected 1.13.0 before 2.0.3

CWE

CWE-770

References

https://discuss.hashicorp.com/t/hcsec-2026-25-multiple-vulnerabilities-impacting-hashicorp-consul/77629

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.