{"id":"CVE-2026-87106","state":"PUBLISHED","title":"Consul vulnerable to a denial of service in the native RPC listener","description":"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.","publishedAt":"2026-09-10T18:55:15.413Z","updatedAt":"2026-09-10T19:02:24.164Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"HashiCorp"},"assigner":"HashiCorp","products":["HashiCorp Consul","HashiCorp Consul Enterprise"],"affected":[{"vendor":"HashiCorp","product":"Consul","defaultStatus":"unaffected","versions":[{"version":"1.21.0","status":"affected","lessThan":"2.0.4","versionType":"semver"}],"platforms":["64 bit","32 bit","x86","ARM","MacOS","Windows","Linux"],"repo":"https://github.com/hashicorp/consul"},{"vendor":"HashiCorp","product":"Consul Enterprise","defaultStatus":"unaffected","versions":[{"version":"1.21.0","status":"affected","lessThan":"2.0.4","changes":[{"at":"1.21.18","status":"unaffected"},{"at":"1.22.12","status":"unaffected"}],"versionType":"semver"}],"platforms":["64 bit","32 bit","x86","ARM","MacOS","Windows","Linux"],"repo":"https://github.com/hashicorp/consul"}],"references":["https://discuss.hashicorp.com/t/hcsec-2026-35-consul-vulnerable-to-a-denial-of-service-in-the-native-rpc-listener/77737"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/87xxx/CVE-2026-87106.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-87106","state":"PUBLISHED","datePublished":"2026-09-10T18:55:15.413Z","dateUpdated":"2026-09-10T19:02:24.164Z","assignerShortName":"HashiCorp","assignerOrgId":"67fedba0-ff2e-4543-ba5b-aa93e87718cc","dateReserved":"2026-09-08T20:19:26.410Z"},"containers":{"cna":{"title":"Consul vulnerable to a denial of service in the native RPC listener","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"HashiCorp","product":"Consul","defaultStatus":"unaffected","versions":[{"version":"1.21.0","status":"affected","lessThan":"2.0.4","versionType":"semver"}],"platforms":["64 bit","32 bit","x86","ARM","MacOS","Windows","Linux"],"repo":"https://github.com/hashicorp/consul"},{"vendor":"HashiCorp","product":"Consul Enterprise","defaultStatus":"unaffected","versions":[{"version":"1.21.0","status":"affected","lessThan":"2.0.4","changes":[{"at":"1.21.18","status":"unaffected"},{"at":"1.22.12","status":"unaffected"}],"versionType":"semver"}],"platforms":["64 bit","32 bit","x86","ARM","MacOS","Windows","Linux"],"repo":"https://github.com/hashicorp/consul"}],"references":[{"url":"https://discuss.hashicorp.com/t/hcsec-2026-35-consul-vulnerable-to-a-denial-of-service-in-the-native-rpc-listener/77737"}],"metrics":[{"cvssV3_1":{"baseScore":6.5,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"HashiCorp","orgId":"67fedba0-ff2e-4543-ba5b-aa93e87718cc","dateUpdated":"2026-09-10T18:56:53.968Z"},"credits":[{"lang":"en","value":"This issue was reported to HashiCorp by Yazdan Soltani."}],"impacts":[{"capecId":"CAPEC-130","descriptions":[{"lang":"en","value":"CAPEC-130: Excessive Allocation"}]}],"source":{"advisory":"HCSEC-2026-35","discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-10T19:02:15.913180Z","id":"CVE-2026-87106","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-10T19:02:24.164Z"}}]}}}