Answer in brief
CVE-2026-73500 records a High severity (CVSS 8.7) vulnerability in etcd: `tlsListener.acceptLoop` spawns unbounded handshake goroutines with no deadline. The current sources do not mark it as known exploited. The current feed maps etcd-io/etcd (generic), go.etcd.io/etcd/client/pkg/v3 (go), go.etcd.io/etcd/v3 (go), go.etcd.io/etcd/v3 (go) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps etcd-io/etcd (generic), go.etcd.io/etcd/client/pkg/v3 (go), go.etcd.io/etcd/v3 (go), go.etcd.io/etcd/v3 (go) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| etcd-io/etcdgeneric | <3.5.33 || >=3.6.0 <3.6.14 || >=3.7.0-alpha.0 <3.7.1 | 3.5.33, 3.6.14, 3.7.1 |
| go.etcd.io/etcd/client/pkg/v3go | >=0 <3.5.33 >=3.6.0 <3.6.14 >=3.7.0-alpha.0 <3.7.1 | 3.5.33, 3.6.14, 3.7.1 |
| go.etcd.io/etcd/v3go | >=3.7.0-alpha.0 <3.7.1 | 3.7.1 |
| go.etcd.io/etcd/v3go | >=3.6.0 <3.6.14 | 3.6.14 |
| go.etcd.io/etcd/v3go | >=0 <3.5.33 | 3.5.33 |
| go.etcd.io/etcd/v3go | >=3.7.0-alpha.0,<3.7.1 | 3.7.1 |
| go.etcd.io/etcd/v3go | >=3.6.0,<3.6.14 | 3.6.14 |
| go.etcd.io/etcd/v3go | <3.5.33 | 3.5.33 |
Published upstream
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 8, 2026
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.
Quoted source text, attributed separately from HOL analysis.