| Name | CVE-2026-73500 |
| Description | 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 | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| etcd (PTS) | bullseye | 3.3.25+dfsg-6 | vulnerable |
| bookworm | 3.4.23-4 | vulnerable | |
| trixie | 3.5.16-4 | vulnerable | |
| forky, sid | 3.5.30-2 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| etcd | source | (unstable) | (unfixed) |
https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3
https://github.com/etcd-io/etcd/pull/22130
Fixed by: https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057 (v3.5.33)