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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-73500)

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0852 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    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.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-73500)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
465768	Echo: go.etcd.io/etcd/client/pkg/v3: security update to 3.5.33	Tenable Cloud Security	Echo Local Security Checks	Local	high
465768	Echo: go.etcd.io/etcd/client/pkg/v3: security update to 3.5.33	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
339170	TencentOS Server 4: etcd (TSSA-2026:0852)	Nessus	Tencent Local Security Checks	Local	high
445912	SCA: security update for go.etcd.io/etcd/v3 (GHSA-6vch-q96h-7gc3)	Tenable Cloud Security	SCA Checks	Local	high
445912	SCA: security update for go.etcd.io/etcd/v3 (GHSA-6vch-q96h-7gc3)	Tenable Self-Hosted Container Security	SCA Checks	Local	high
335145	Linux Distros Unpatched Vulnerability : CVE-2026-73500	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-73500

high

Tenable Plugins

high

high

high

high

high

high