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CVE-2026-73500 is a denial-of-service vulnerability in etcd, the distributed key-value store commonly used by distributed systems and Kubernetes control planes. In affected versions prior to 3.5.33, 3.6.14, and 3.7.1, an attacker that can reach an etcd TLS listener can establish large numbers of TCP connections and withhold the TLS ClientHello. In client/pkg/transport/listener_tls.go, each accepted connection processed by tlsListener.acceptLoop spawns a goroutine that can block indefinitely inside tls.Conn.Handshake() while the connection remains tracked in a pending map. Because these blocked handshakes are not effectively bounded, the process can accumulate unbounded goroutines and pending connection state, leading to memory exhaustion and service unavailability.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability affecting TencentOS Server 4 and the etcd package/component, with network attack vector and high availability impact.
A high-severity network-reachable denial-of-service vulnerability in etcd where tlsListener.acceptLoop spawns unbounded TLS handshake goroutines without a deadline, allowing memory exhaustion and loss of availability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.