{"cve":"CVE-2026-73500","nvd":{"published":"2026-08-12T22:17:17.290","modified":"2026-10-24T15:10:00.190","status":"Awaiting Analysis","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.","cvss_v4":{"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","score":8.7},"cvss_v3":null,"cwes":["CWE-770"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-73500","score":0.00697,"percentile":0.52766,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-6vch-q96h-7gc3","url":"https://osv.dev/vulnerability/GHSA-6vch-q96h-7gc3","summary":"etcd: `tlsListener.acceptLoop` spawns unbounded handshake goroutines with no deadline","modified":"2026-09-10T03:51:10.799208997Z","packages":[{"ecosystem":"Go","name":"go.etcd.io/etcd/v3","purl":"pkg:golang/go.etcd.io/etcd/v3","ranges":[">=3.7.0-alpha.0 <3.7.1"],"fixed":["3.7.1"]},{"ecosystem":"Go","name":"go.etcd.io/etcd/v3","purl":"pkg:golang/go.etcd.io/etcd/v3","ranges":[">=3.6.0 <3.6.14"],"fixed":["3.6.14"]},{"ecosystem":"Go","name":"go.etcd.io/etcd/v3","purl":"pkg:golang/go.etcd.io/etcd/v3","ranges":["<3.5.33"],"fixed":["3.5.33"]}]},{"id":"GO-2026-6107","url":"https://osv.dev/vulnerability/GO-2026-6107","summary":"Unbounded TLS handshake goroutines in go.etcd.io/etcd/client/pkg/v3","modified":"2026-08-19T21:41:59.273853582Z","packages":[{"ecosystem":"Go","name":"go.etcd.io/etcd/client/pkg/v3","purl":"pkg:golang/go.etcd.io/etcd/client/pkg/v3","ranges":["<3.5.33",">=3.6.0 <3.6.14",">=3.7.0-alpha.0 <3.7.1"],"fixed":["3.5.33","3.6.14","3.7.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}