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CVE-2026-73500

etcd: `tlsListener.acceptLoop` spawns unbounded handshake goroutines with no deadline

HIGH
8.7
CVSS Score
Published: August 12, 2026 at 09:22 PM UTC
Updated: October 24, 2026 at 03:10 PM UTC
1 product affected across 1 vendorEtcd

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Severity
HIGH8.7
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Etcd· Etcd Io
90%
v < 3.5.33>= 3.6.0, < 3.6.14>= 3.7.0-alpha.0, < 3.7.1
Affected range stops below 3.5.33, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.6.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.7.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (9)

x_refsource_CONFIRM
Source: cverecord
https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3
x_refsource_MISC
Source: cverecord
https://github.com/etcd-io/etcd/pull/22130
x_refsource_MISC
Source: cverecord
https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2
x_refsource_MISC
Source: cverecord
https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372
x_refsource_MISC
Source: cverecord
https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3
x_refsource_MISC
Source: cverecord
https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057
x_refsource_MISC
Source: cverecord
https://github.com/etcd-io/etcd/releases/tag/v3.5.33
x_refsource_MISC
Source: cverecord
https://github.com/etcd-io/etcd/releases/tag/v3.6.14

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-770

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