{"id":"CVE-2026-15972","state":"PUBLISHED","title":"Unauthenticated denial of service via unbounded external gRPC connection acceptance","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.","publishedAt":"2026-08-07T19:20:22.442Z","updatedAt":"2026-08-10T18:24:14.625Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/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":"1.13.0","status":"affected","lessThan":"2.0.3","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":"1.13.0","status":"affected","lessThan":"2.0.3","changes":[{"at":"1.21.17","status":"unaffected"},{"at":"1.22.11","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-2026-25-multiple-vulnerabilities-impacting-hashicorp-consul/77629"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:11:00.674Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/15xxx/CVE-2026-15972.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-15972","state":"PUBLISHED","datePublished":"2026-08-07T19:20:22.442Z","dateUpdated":"2026-08-10T18:24:14.625Z","assignerShortName":"HashiCorp","assignerOrgId":"67fedba0-ff2e-4543-ba5b-aa93e87718cc","dateReserved":"2026-07-16T15:32:34.132Z"},"containers":{"cna":{"title":"Unauthenticated denial of service via unbounded external gRPC connection acceptance","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"HashiCorp","product":"Consul","defaultStatus":"unaffected","versions":[{"version":"1.13.0","status":"affected","lessThan":"2.0.3","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":"1.13.0","status":"affected","lessThan":"2.0.3","changes":[{"at":"1.21.17","status":"unaffected"},{"at":"1.22.11","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-2026-25-multiple-vulnerabilities-impacting-hashicorp-consul/77629"}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"HashiCorp","orgId":"67fedba0-ff2e-4543-ba5b-aa93e87718cc","dateUpdated":"2026-08-07T19:20:22.442Z"},"credits":[{"lang":"en","value":"This issue was reported by Erichen."}],"impacts":[{"capecId":"CAPEC-125","descriptions":[{"lang":"en","value":"CAPEC-125: Flooding"}]}],"source":{"advisory":"HCSEC-2026-25","discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-10T17:39:56.729163Z","id":"CVE-2026-15972","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-10T18:24:14.625Z"}}]}}}