{"id":"CVE-2026-73500","revision":"1b75142d7046441dbd99c59dc7f8a799","records":[{"revision":"1b75142d7046441dbd99c59dc7f8a799","observedAt":"2026-10-25T15:19:09.409+00:00","statement":{"source":"nvd","id":"CVE-2026-73500","aliases":[],"title":"etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a network attacker who can reach an etcd TLS listener can open many TCP connections and never send a ClientHello. In cl…","description":"etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a network attacker who can reach an etcd TLS listener can open many TCP connections and never send a ClientHello. In client/pkg/transport/listener_tls.go, each connection handled by tlsListener.acceptLoop spawns a goroutine that blocks indefinitely inside tls.Conn.Handshake() and remains tracked in the pending map. Unbounded goroutine and map growth can exhaust memory in the etcd process, causing loss of availability for the cluster and, when etcd backs Kubernetes, the control plane. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1.","state":0,"publishedAt":"2026-08-12T22:17:17.29+00:00","modifiedAt":"2026-10-24T15:10:00.19+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.7,"severity":"HIGH"}],"references":["https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2","https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372","https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3","https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057","https://github.com/etcd-io/etcd/pull/22130","https://github.com/etcd-io/etcd/releases/tag/v3.5.33","https://github.com/etcd-io/etcd/releases/tag/v3.6.14","https://github.com/etcd-io/etcd/releases/tag/v3.7.1","https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73500","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-770"],"productCriteria":[],"sourceDates":{"published":"2026-08-12T22:17:17.290","lastModified":"2026-10-24T15:10:00.190"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-73500","identifiers":["CVE-2026-73500"]},"retained":false,"historicalAffected":[]}],"coverage":[]}