CVE-2026-73500

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.

• CWE-770

• 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

Published

Aug 12, 2026

Last Modified

Aug 13, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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