--- id: CVE-2026-73500 title: etcd is a distributed key-value store for the data of a distributed system summary: >- 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… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-770 vendor: Red Hat product: Red Hat Trusted Artifact Signer affected: - cert_manager_operator_for_red_hat_openshift - externaldns_operator - multicluster_engine_for_kubernetes - multicluster_global_hub - advanced_cluster_management_for_kubernetes 2 - ceph_storage 5 - ceph_storage 6 - ceph_storage 7 - ceph_storage 8 - ceph_storage 9 - openshift_dev_spaces - openstack_platform 16.2 - openstack_platform 17.1 - openstack_platform 18.0 - trusted_artifact_signer - hardened_images patched: - hardened_images published: '2026-08-12' updated: '2026-09-18' sourceUpdated: '2026-09-18T20:05:53.723' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73500' references: - url: >- https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2 label: security-advisories@github.com - url: >- https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372 label: security-advisories@github.com - url: >- https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3 label: security-advisories@github.com - url: >- https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057 label: security-advisories@github.com - url: 'https://github.com/etcd-io/etcd/pull/22130' label: security-advisories@github.com - url: 'https://github.com/etcd-io/etcd/releases/tag/v3.5.33' label: security-advisories@github.com - url: 'https://github.com/etcd-io/etcd/releases/tag/v3.6.14' label: security-advisories@github.com - url: 'https://github.com/etcd-io/etcd/releases/tag/v3.7.1' label: security-advisories@github.com - url: 'https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3' label: security-advisories@github.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73500.json - url: 'https://access.redhat.com/security/cve/CVE-2026-73500' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2515007' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-73500' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73500' - url: 'https://access.redhat.com/errata/RHSA-2026:44868' - url: 'https://github.com/etcd-io/etcd' - url: 'https://access.redhat.com/errata/RHSA-2026:67516' - url: 'https://access.redhat.com/errata/RHSA-2026:70829' - url: 'https://access.redhat.com/errata/RHSA-2026:70826' - url: 'https://access.redhat.com/errata/RHSA-2026:70828' - url: 'https://access.redhat.com/errata/RHSA-2026:71597' tags: - nvd - csaf - vex - red-hat - osv - go epss: 0.00697 epssPercentile: 0.51001 aliases: - GHSA-6vch-q96h-7gc3 - BIT-etcd-2026-73500 - GO-2026-6107 ecosystem: go cvssSource: vendor ingestedAt: '2026-08-13T19:18:21.035Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Package advisory (CVE-2026-73500) Affected packages: - `go.etcd.io/etcd/v3 >= 3.7.0-alpha.0, < 3.7.1` - `go.etcd.io/etcd/v3 >= 3.6.0, < 3.6.14` - `go.etcd.io/etcd/v3 < 3.5.33` Patched in: - `go.etcd.io/etcd/v3 3.7.1` - `go.etcd.io/etcd/v3 3.6.14` - `go.etcd.io/etcd/v3 3.5.33` Source: https://osv.dev/vulnerability/GHSA-6vch-q96h-7gc3 ## Vendor advisories - **RHSA-2026:44868** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:44868) - **Red Hat VEX** · Important · affected: cert-manager Operator for Red Hat OpenShift, Cryostat 4, ExternalDNS Operator, Multicluster Engine for Kubernetes, OpenShift Serverless, Red Hat Ceph Storage 5, … · no fix planned: Multicluster Engine for Kubernetes, cert-manager Operator for Red Hat OpenShift, Cryostat 4, ExternalDNS Operator, … · updated 2026-09-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73500.json) - **RHSA-2026:67516** · Red Hat · fixed in: Multicluster Global Hub 1.4.9 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67516) - **RHSA-2026:70829** · Red Hat · fixed in: Red Hat Trusted Artifact Signer 1.3 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70829) - **RHSA-2026:70826** · Red Hat · fixed in: Red Hat Trusted Artifact Signer 1.3 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70826) - **RHSA-2026:70828** · Red Hat · fixed in: Red Hat Trusted Artifact Signer 1.3 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70828) - **RHSA-2026:71597** · Red Hat · fixed in: Multicluster Global Hub 1.5.8 · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71597)