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CVE-2026-19012— Authenticated denial of service in Consul Enterprise-to-Community Edition downgrade path

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 1.18.0版本至2.0.2版本存在异常处理不当漏洞，该漏洞源于Enterprise-to-Community Edition降级路径中的认证拒绝服务问题，具有config-entry写权限的调用者可通过提交service-router配置条目导致agent意外退出，进而导致Consul服务器崩溃。

CVSS 5.3 · Medium EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
HashiCorp Consul 1.18.0< 2.0.3 affected
HashiCorp Consul Enterprise 1.18.0< 2.0.3 affected
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I. Basic Information for CVE-2026-19012

Vulnerability Information
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Vulnerability Title
Authenticated denial of service in Consul Enterprise-to-Community Edition downgrade path
Source: CVE Program / CVE List V5
Vulnerability Description
Consul Community Edition and Consul Enterprise 1.18.0 through 2.0.2 are vulnerable to an authenticated denial of service in the Enterprise-to-Community Edition downgrade path that may allow an authorized caller to crash the Consul server. A caller with config-entry write permission can submit a service-router configuration entry that causes the agent to exit unexpectedly. This vulnerability, CVE-2026-19012, 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:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
HashiCorp Consul 异常处理不当漏洞
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 1.18.0版本至2.0.2版本存在异常处理不当漏洞，该漏洞源于Enterprise-to-Community Edition降级路径中的认证拒绝服务问题，具有config-entry写权限的调用者可通过提交service-router配置条目导致agent意外退出，进而导致Consul服务器崩溃。
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 1.18.0 ~ 2.0.3 -
HashiCorp Consul Enterprise 1.18.0 ~ 2.0.3 -

II. Public POCs for CVE-2026-19012

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III. Intelligence Information for CVE-2026-19012

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Vendor Advisories for CVE-2026-19012 (1)

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

CVE-2026-15972 7.5 HIGH Unauthenticated denial of service via unbounded external gRPC connection acceptance
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-2026-19015 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-476

V. Comments for CVE-2026-19012

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