CVE-2026-73500

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

August 12, 2026

Last Modified

August 13, 2026

Advisory Details (9)

Auto-updated Aug 12, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v3.7.1

Patch available: etcd-io/etcd v3.7.1

https://github.com/etcd-io/etcd/releases/tag/v3.7.1
github_release Patch Available

v3.6.14

Patch available: etcd-io/etcd v3.6.14

https://github.com/etcd-io/etcd/releases/tag/v3.6.14
github_release Patch Available

v3.5.33

Patch available: etcd-io/etcd v3.5.33

https://github.com/etcd-io/etcd/releases/tag/v3.5.33
github_commit

commit f73cba7d9200 (etcd-io/etcd)

Fix landed in etcd-io/etcd commit f73cba7d9200 — awaiting tagged release

https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057
github_commit

commit 8e4dd0679a2c (etcd-io/etcd)

Fix landed in etcd-io/etcd commit 8e4dd0679a2c — awaiting tagged release

https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3
github_commit

commit 89ff6d507960 (etcd-io/etcd)

Fix landed in etcd-io/etcd commit 89ff6d507960 — awaiting tagged release

https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372
github_commit

commit 2e07efce9745 (etcd-io/etcd)

Fix landed in etcd-io/etcd commit 2e07efce9745 — awaiting tagged release

https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2
github_pr

Set a tlsHandshakeTimeout for tlsListener

Fix merged in etcd-io/etcd PR #22130 on 2026-07-21 — awaiting tagged release

https://github.com/etcd-io/etcd/pull/22130
github Patch Available

`tlsListener.acceptLoop` spawns unbounded handshake goroutines with no deadline · Advisory · etcd-io/etcd · GitHub

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

Vendor Advisories for CVE-2026-73500(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
go.etcd.io/etcd/v3—3.7.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 16× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-26 18:48 UTCEG score recompute
  2. 2026-08-26 18:48 UTCVendor advisory
  3. 2026-08-26 14:47 UTCEPSS rescore
  4. 2026-08-26 05:02 UTCVendor advisory
  5. 2026-08-25 17:13 UTCEG score recompute
  6. 2026-08-25 17:13 UTCVendor advisory
  7. 2026-08-25 13:49 UTCEPSS rescore
  8. 2026-08-25 05:03 UTCVendor advisory
  9. 2026-08-24 17:16 UTCEG score recompute
  10. 2026-08-24 17:16 UTCVendor advisory
  11. 2026-08-23 05:04 UTCEG score recompute
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-22 05:30 UTCEG score recompute
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 05:56 UTCEG score recompute
  16. 2026-08-20 22:56 UTCEPSS rescore
  17. 2026-08-19 18:33 UTCEG score recompute
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-18 17:15 UTCEG score recompute
  20. 2026-08-18 13:49 UTCEPSS rescore
  21. 2026-08-18 13:49 UTCEPSS rescore
  22. 2026-08-17 16:36 UTCEG score recompute
  23. 2026-08-17 13:47 UTCEPSS rescore
  24. 2026-08-16 17:02 UTCEG score recompute
  25. 2026-08-16 14:56 UTCEPSS rescore
Show 12 more
  1. 2026-08-16 14:56 UTCEPSS rescore
  2. 2026-08-16 05:14 UTCEG score recompute
  3. 2026-08-16 02:15 UTCEPSS rescore
  4. 2026-08-15 05:41 UTCEG score recompute
  5. 2026-08-15 01:31 UTCEPSS rescore
  6. 2026-08-14 06:06 UTCEG score recompute
  7. 2026-08-13 22:00 UTCEPSS rescore
  8. 2026-08-13 18:19 UTCEG score recompute
  9. 2026-08-13 18:12 UTCEG score recompute
  10. 2026-08-12 22:21 UTCEG score recompute
  11. 2026-08-12 21:41 UTCEG score recompute
  12. 2026-08-12 21:40 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-73500?
CVE-2026-73500 is a high vulnerability published on August 12, 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…
When was CVE-2026-73500 disclosed?
CVE-2026-73500 was first published in the National Vulnerability Database on August 12, 2026, with the most recent update on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73500 actively exploited?
CVE-2026-73500 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 67.4% of all scored CVEs.
What is the CVSS score of CVE-2026-73500?
CVE-2026-73500 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-73500?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73500, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-73500

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