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High severityNVD Advisory· Published Aug 12, 2026· Updated Sep 18, 2026

CVE-2026-73500

CVE-2026-73500

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
go.etcd.io/etcd/v3Go
>= 3.7.0-alpha.0, < 3.7.13.7.1
go.etcd.io/etcd/v3Go
>= 3.6.0, < 3.6.143.6.14
go.etcd.io/etcd/v3Go
< 3.5.333.5.33

Affected products

930

Patches

Vulnerability mechanics

References

10

News mentions

0

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