CVE-2026-15972Network attack vectorHinoki check available

Unauthenticated denial of service via unbounded gRPC connections

Published Aug 7, 2026 · Updated Aug 7, 2026

Uncontrolled resource allocation in HashiCorp Consul and Consul Enterprise 1.13.0 through 2.0.2 allows remote attackers to interrupt service. The external gRPC listeners retain file descriptors, goroutines, and memory for incomplete connections without per-source limits or short establishment timeouts. Only deployments with external gRPC or gRPC-TLS listeners enabled are exposed; no valid gRPC request or ACL token is required, and sustained connections can block legitimate clients.

CVSS severity7.5
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Uncontrolled resource allocation in HashiCorp Consul and Consul Enterprise 1.13.0 through 2.0.2 allows remote attackers to interrupt service. The external gRPC listeners retain file descriptors, goroutines, and memory for incomplete connections without per-source limits or short establishment timeouts. Only deployments with external gRPC or gRPC-TLS listeners enabled are exposed; no valid gRPC request or ACL token is required, and sustained connections can block legitimate clients.

The record

CVE
CVE-2026-15972
Published
Aug 7, 2026
Updated
Aug 7, 2026
Vendor
HashiCorp
Product
Consul Enterprise
Classifications
CWE-770, CAPEC-125, T1498.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.13.0 <2.0.3 changes=[{"at":"1.21.17","status":"unaffected"},{"at":"1.22.11","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HashiCorp · Consul Enterpriseversion=1.13.0 <2.0.3 changes=[{"at":"1.21.17","status":"unaffected"},{"at":"1.22.11","status":"unaffected"}]
HashiCorp · Consulversion=1.13.0 <2.0.3

Published CVSS scores

7.5HashiCorpCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-125Flooding
T1498.001Direct Network Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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