GHSA-6vch-q96h-7gc3

Source

https://github.com/advisories/GHSA-6vch-q96h-7gc3

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6vch-q96h-7gc3/GHSA-6vch-q96h-7gc3.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-6vch-q96h-7gc3

Aliases

Downstream

CGA (1903)

ECHO (1)

ECHO-ffe1-bcbe-9b33

MINI (281)

Published

2026-07-24T22:40:16Z

Modified

2026-08-18T17:25:39Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

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

Details

Impact

What kind of vulnerability is it? Who is impacted?

A network attacker who can reach an etcd TLS listener can open many TCP connections and never send a ClientHello. Each connection spawns a goroutine in the etcd server process that blocks indefinitely inside tls.Conn.Handshake(), and each is tracked in the pending map. Unbounded goroutine and map growth exhausts memory in the etcd process, causing loss of availability for the etcd cluster (and, when etcd backs Kubernetes, the control plane).

Patches

Has the problem been patched? What versions should users upgrade to?

This vulnerability is patched in the following versions:

etcd 3.7.1
etcd 3.6.14
etcd 3.5.33

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

If upgrading is not immediately possible, then restrict network access. Limit which hosts can reach etcd's client (gRPC) port via firewall rules or network policy, reducing who can attempt exploitation.

Reporter

VMware By Broadcom

Database specific

{
    "cwe_ids":  [
        "CWE-770"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-07-24T22:40:16Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}

References

Affected packages

Go / go.etcd.io/etcd/v3

Package

Name: go.etcd.io/etcd/v3; View open source insights on deps.dev
Purl: pkg:golang/go.etcd.io/etcd/v3

Affected ranges

Type: SEMVER
Events: Introduced

3.7.0-alpha.0

Fixed

3.7.1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6vch-q96h-7gc3/GHSA-6vch-q96h-7gc3.json"

Go / go.etcd.io/etcd/v3

Package

Name: go.etcd.io/etcd/v3; View open source insights on deps.dev
Purl: pkg:golang/go.etcd.io/etcd/v3

Affected ranges

Type: SEMVER
Events: Introduced

3.6.0

Fixed

3.6.14

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6vch-q96h-7gc3/GHSA-6vch-q96h-7gc3.json"

Go / go.etcd.io/etcd/v3

Package

Name: go.etcd.io/etcd/v3; View open source insights on deps.dev
Purl: pkg:golang/go.etcd.io/etcd/v3

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

3.5.33

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6vch-q96h-7gc3/GHSA-6vch-q96h-7gc3.json"