8.7

CVE-2026-73500

etcd: `tlsListener.acceptLoop` spawns unbounded handshake goroutines with no deadline

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstelleretcd-io
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Produkt etcd
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
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.4% 0.327
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 8.7 0 0
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
CWE-770 Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

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
https://github.com/etcd-io/etcd/pull/22130
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