Vulnerability DatabaseCVE-2026-73500
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CVE-2026-73500
Published:August 12, 2026
Updated:August 31, 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.
Affected Packages
https://github.com/etcd-io/etcd.git (GITHUB):
Affected version(s) >=v3.7.0-alpha.0 <v3.7.1
Fix Suggestion:
Update to version v3.7.1
https://github.com/etcd-io/etcd.git (GITHUB):
Affected version(s) >=v3.0.0 <v3.5.33
Fix Suggestion:
Update to version v3.5.33
https://github.com/etcd-io/etcd.git (GITHUB):
Affected version(s) >=v3.6.0 <v3.6.14
Fix Suggestion:
Update to version v3.6.14
go.etcd.io/etcd/v3 (GO):
Affected version(s) >=v3.0.0-20190508105828-886d30d223a0 <v3.5.33
Fix Suggestion:
Update to version v3.5.33
go.etcd.io/etcd/v3 (GO):
Affected version(s) >=v3.6.0 <v3.6.14
Fix Suggestion:
Update to version v3.6.14
go.etcd.io/etcd/v3 (GO):
Affected version(s) >=v3.0.0-20190508105828-886d30d223a0 <v3.5.33
Fix Suggestion:
Update to version v3.5.33
go.etcd.io/etcd/v3 (GO):
Affected version(s) >=v3.6.0 <v3.6.14
Fix Suggestion:
Update to version v3.6.14
go.etcd.io/etcd/v3 (GO):
Affected version(s) >=v3.7.0-alpha.0.0.20260513114709-9c420dfa0eb7 <v3.7.1
Fix Suggestion:
Update to version v3.7.1
Related Resources (12)
https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3
https://github.com/etcd-io/etcd/releases/tag/v3.6.14
https://github.com/etcd-io/etcd/releases/tag/v3.5.33
https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372
https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73500.json
https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3
https://nvd.nist.gov/vuln/detail/CVE-2026-73500
https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2
https://github.com/etcd-io/etcd/pull/22130
https://github.com/etcd-io/etcd/releases/tag/v3.7.1
https://github.com/etcd-io/etcd
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
CWE-770
EPSS
Base Score:
0.40