Is CVE-2026-73500 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-73500 being exploited in the wild.

How severe is CVE-2026-73500?

Medium severity, with a CVSS score of 4, published 12 August 2026.

Which products and versions are affected?

go.etcd.io/etcd/client/pkg/v3 (Go) SEMVER:introduced=0,fixed=3.5.33,introduced=3.6.0,fixed=3.6.14,introduced=3.7.0-alpha.0,fixed=3.7.1; go.etcd.io/etcd/v3 (Go) SEMVER:introduced=3.7.0-alpha.0,fixed=3.7.1.

Is there a fix for CVE-2026-73500?

Yes. go.etcd.io/etcd/client/pkg/v3 (Go): upgrade to 3.7.1 or later; go.etcd.io/etcd/v3 (Go): upgrade to 3.7.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-73500 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-73500?

Check whether you run go.etcd.io/etcd/client/pkg/v3 (Go) or go.etcd.io/etcd/v3 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-73500: etcd TLS listener denial of service via connection exhaustion

CVE-2026-73500 · Severity: medium · CVSS 4 · Published 2026-08-12

etcd is a distributed key-value store that manages configuration and state for systems like Kubernetes clusters. A network attacker can establish many TCP connections to the TLS listener without completing the handshake, causing the process to consume unbounded memory and crash. When etcd backs a Kubernetes control plane, this leads to complete cluster unavailability.

Technologies: go.etcd.io/etcd/v3 (Go). Vendors: Go.

Quick answers

Is CVE-2026-73500 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-73500 being exploited in the wild.
How severe is CVE-2026-73500?: Medium severity, with a CVSS score of 4, published 12 August 2026.
Which products and versions are affected?: go.etcd.io/etcd/client/pkg/v3 (Go) SEMVER:introduced=0,fixed=3.5.33,introduced=3.6.0,fixed=3.6.14,introduced=3.7.0-alpha.0,fixed=3.7.1; go.etcd.io/etcd/v3 (Go) SEMVER:introduced=3.7.0-alpha.0,fixed=3.7.1.
Is there a fix for CVE-2026-73500?: Yes. go.etcd.io/etcd/client/pkg/v3 (Go): upgrade to 3.7.1 or later; go.etcd.io/etcd/v3 (Go): upgrade to 3.7.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-73500 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-73500?: Check whether you run go.etcd.io/etcd/client/pkg/v3 (Go) or go.etcd.io/etcd/v3 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

go.etcd.io/etcd/client/pkg/v3 (Go): upgrade to 3.7.1 or later
```
go get go.etcd.io/etcd/client/pkg/v3@v3.7.1
```
go.etcd.io/etcd/v3 (Go): upgrade to 3.7.1 or later
```
go get go.etcd.io/etcd/v3@v3.7.1
```

Technical details

The vulnerability is a denial-of-service flaw in the TLS connection handling code (client/pkg/transport/listener_tls.go). When a client connects to the TLS listener but never sends a ClientHello message, the acceptLoop spawns a goroutine that blocks indefinitely in tls.Conn.Handshake() while remaining tracked in a pending connection map. An attacker on the network can open many such incomplete connections, causing unbounded growth of goroutines and the pending map, exhausting memory and crashing the etcd process. The fix implements a tlsHandshakeTimeout to bound the duration of incomplete handshakes. Versions 3.5.33, 3.6.14, and 3.7.1 and later are patched.

Affected products

etcd etcd prior to 3.5.33, 3.6.14, and 3.7.1

Identifiers

CVE-2026-73500
GHSA-6vch-q96h-7gc3
GO-2026-6107

Timeline

2026-08-12: disclosed
2026-08-12: patched: Versions 3.5.33, 3.6.14, and 3.7.1 and later

References

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