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CVE-2026-73500— etcd: `tlsListener.acceptLoop` spawns unbounded handshake goroutines with no deadline

Quick assessment

Affected
etcd-io etcd
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

etcd-io etcd是etcd-io团队的一款分布式键值存储系统。 etcd-io etcd 3.5.33之前版本、3.6.14之前版本和3.7.1之前版本存在资源管理错误漏洞，该漏洞源于TLS握手处理不当，可能导致网络攻击者通过大量TCP连接且不发送ClientHello，造成goroutine和映射无限增长并耗尽内存，导致集群可用性丧失。

CVSS 8.7 · High EPSS 0.70% · P52

Affected Version Matrix 3

VendorProduct Version RangeStatus
etcd-io etcd < 3.5.33 affected
>= 3.6.0, < 3.6.14 affected
>= 3.7.0-alpha.0, < 3.7.1 affected
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I. Basic Information for CVE-2026-73500

Vulnerability Information
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Vulnerability Title
etcd: `tlsListener.acceptLoop` spawns unbounded handshake goroutines with no deadline
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
etcd-io etcd 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
etcd-io etcd是etcd-io团队的一款分布式键值存储系统。 etcd-io etcd 3.5.33之前版本、3.6.14之前版本和3.7.1之前版本存在资源管理错误漏洞，该漏洞源于TLS握手处理不当，可能导致网络攻击者通过大量TCP连接且不发送ClientHello，造成goroutine和映射无限增长并耗尽内存，导致集群可用性丧失。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
etcd-io etcd < 3.5.33 -

II. Public POCs for CVE-2026-73500

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7640 chars
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III. Intelligence Information for CVE-2026-73500

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Patches & Fixes for CVE-2026-73500 (4)

Vendor Advisories for CVE-2026-73500 (1)

Vendor Pages for CVE-2026-73500 (1)

IV. Related Vulnerabilities

Same product: etcd
Same vendor: etcd-io
Same weakness: CWE-770

V. Comments for CVE-2026-73500

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