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

Quick assessment

Affected
HashiCorp Consul
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HashiCorp Consul是美国HashiCorp公司的一款服务发现与配置管理中间件。 HashiCorp Consul 1.13.0至2.0.2版本存在资源管理错误漏洞，该漏洞源于外部gRPC监听器无限制接受连接，可能导致未经身份验证的远程攻击者通过打开大量不完整连接耗尽代理文件描述符、goroutines和内存，从而阻止合法客户端连接。

CVSS 7.5 · High EPSS 0.55% · P44

Affected Version Matrix 2

VendorProduct Version RangeStatus
HashiCorp Consul 1.13.0< 2.0.3 affected
HashiCorp Consul Enterprise 1.13.0< 2.0.3 affected
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I. Basic Information for CVE-2026-15972

Vulnerability Information
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Vulnerability Title
Unauthenticated denial of service via unbounded external gRPC connection acceptance
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
HashiCorp Consul 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HashiCorp Consul是美国HashiCorp公司的一款服务发现与配置管理中间件。 HashiCorp Consul 1.13.0至2.0.2版本存在资源管理错误漏洞，该漏洞源于外部gRPC监听器无限制接受连接，可能导致未经身份验证的远程攻击者通过打开大量不完整连接耗尽代理文件描述符、goroutines和内存，从而阻止合法客户端连接。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
HashiCorp Consul 1.13.0 ~ 2.0.3 -
HashiCorp Consul Enterprise 1.13.0 ~ 2.0.3 -

II. Public POCs for CVE-2026-15972

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III. Intelligence Information for CVE-2026-15972

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Vendor Advisories for CVE-2026-15972 (1)

Same Patch Batch · HashiCorp · 2026-08-07 · 8 CVEs total

CVE-2026-19017 6.8 MEDIUM Consul vulnerable to partial arbitrary file read via Vault Connect CA provider
CVE-2026-19113 5.3 MEDIUM Unauthenticated denial of service via unbounded request body processing
CVE-2026-19012 5.3 MEDIUM Authenticated denial of service in Consul Enterprise-to-Community Edition downgrade path
CVE-2026-19015 5.3 MEDIUM Uncontrolled resource consumption in the Consul Connect CA roots endpoint
CVE-2026-19014 4.3 MEDIUM Uncontrolled resource consumption in the Consul Connect authorization endpoint
CVE-2026-15970 4.2 MEDIUM L7 intention authorization bypass via custom public listener
CVE-2026-19016 4.2 MEDIUM Authorization bypass for session deletion in the transaction API

IV. Related Vulnerabilities

Same product: Consul
Same vendor: HashiCorp
Same weakness: CWE-770

V. Comments for CVE-2026-15972

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