CVE intelligence

CVE-2026-73500

Vulnerability intelligence

Published Aug 12, 2026Sources checked Oct 28, 2026

8.7HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-73500 and is rated High severity with a CVSS score of 8.7. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Aug 23, 2026

Vendor remediation details

CBL-Mariner Releases

Vendor-listed releases

0.24.2-30
2.14.1-17
0.0.10-8
1.30.10-28
1.12.15-12
0.5.1-7
0.12.0-9

CISA KEVNot listedBased on the latest collected catalog

EPSS0.4%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is 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.

Source: NVD