{"id":"CVE-2026-73500","sourceIdentifier":"security-advisories@github.com","published":"2026-08-12T22:17:17.290","lastModified":"2026-10-24T15:10:00.190","vulnStatus":"Awaiting Analysis","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"etcd es un almacén distribuido de clave-valor para los datos de un sistema distribuido. Antes de las versiones 3.5.33, 3.6.14 y 3.7.1, un atacante de red que puede alcanzar un oyente TLS de etcd puede abrir muchas conexiones TCP y nunca enviar un ClientHello. En client/pkg/transport/listener_tls.go, cada conexión manejada por tlsListener.acceptLoop genera una goroutine que se bloquea indefinidamente dentro de tls.Conn.Handshake() y permanece rastreada en el mapa de pendientes. El crecimiento ilimitado de goroutines y del mapa puede agotar la memoria en el proceso de etcd, causando la pérdida de disponibilidad para el clúster y, cuando etcd respalda a Kubernetes, el plano de control. Este problema está solucionado en las versiones 3.5.33, 3.6.14 y 3.7.1."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"etcd-io","product":"etcd","versions":[{"version":"< 3.5.33","status":"affected"},{"version":">= 3.6.0, < 3.6.14","status":"affected"},{"version":">= 3.7.0-alpha.0, < 3.7.1","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"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","baseScore":8.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-13T17:49:14.567913Z","id":"CVE-2026-73500","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-770"}]}],"references":[{"url":"https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2","source":"security-advisories@github.com"},{"url":"https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372","source":"security-advisories@github.com"},{"url":"https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3","source":"security-advisories@github.com"},{"url":"https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057","source":"security-advisories@github.com"},{"url":"https://github.com/etcd-io/etcd/pull/22130","source":"security-advisories@github.com"},{"url":"https://github.com/etcd-io/etcd/releases/tag/v3.5.33","source":"security-advisories@github.com"},{"url":"https://github.com/etcd-io/etcd/releases/tag/v3.6.14","source":"security-advisories@github.com"},{"url":"https://github.com/etcd-io/etcd/releases/tag/v3.7.1","source":"security-advisories@github.com"},{"url":"https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3","source":"security-advisories@github.com"}]}