High severity · published Aug 7, 2026
CVE-2026-15972
Unauthenticated denial of service via unbounded external gRPC connection acceptance
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
Consul · HashiCorp
1.13.0 before 2.0.3 · source: vendor
CE
Consul Enterprise · HashiCorp
1.13.0 before 2.0.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15972
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15972
discuss.hashicorp.com
https://discuss.hashicorp.com/t/hcsec-2026-25-multiple-vulnerabilities-impacting-hashicorp-consul/77629
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