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CVE-2026-87106

Consul vulnerable to a denial of service in the native RPC listener

CVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-87106

Published

Consul and Consul Enterprise are vulnerable to a denial of service in the native RPC listener that may allow an authenticated client to exhaust server memory before ACL authorization is evaluated. A client that can complete the internal RPC mTLS handshake may exploit this issue without holding a valid ACL token. This vulnerability (CVE-2026-87106) is fixed in Consul 2.0.4 and Consul Enterprise 1.21.18, 1.22.12 and 2.0.4.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-87106

Published

Consul

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "platforms": [
                        "64 bit",
                        "32 bit",
                        "x86",
                        "ARM",
                        "MacOS",
                        "Windows",
                        "Linux"
                    ],
                    "product": "Consul",
                    "repo": "https://github.com/hashicorp/consul",
                    "vendor": "HashiCorp",
                    "versions": [
                        {
                            "lessThan": "2.0.4",
                            "status": "affected",
                            "version": "1.21.0",
                            "versionType": "semver"
                        }
                    ]
                }

Consul Enterprise

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "platforms": [
                        "64 bit",
                        "32 bit",
                        "x86",
                        "ARM",
                        "MacOS",
                        "Windows",
                        "Linux"
                    ],
                    "product": "Consul Enterprise",
                    "repo": "https://github.com/hashicorp/consul",
                    "vendor": "HashiCorp",
                    "versions": [
                        {
                            "changes": [
                                {
                                    "at": "1.21.18",
                                    "status": "unaffected"
                                },
                                {
                                    "at": "1.22.12",
                                    "status": "unaffected"
                                }
                            ],
                            "lessThan": "2.0.4",
                            "status": "affected",
                            "version": "1.21.0",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON