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 66% 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

A fix is available — apply it.

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
34%
KEV
Not listed

Published

August 12, 2026

Last Modified

September 18, 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(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatetcd-main-3.7.1-0.1.hum12026-07-24redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Go(2)
PackageVulnerable rangeFixed inDependents
go.etcd.io/etcd/client/pkg/v3—3.7.1—
go.etcd.io/etcd/v3—3.5.33—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
etcd3.4.23-4 ... 3.5.5-1 (30 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
etcd3.5.16-10 ... 3.5.30-2 (13 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
etcd3.5.16-10 ... 3.5.30-2 (13 versions)——

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 25× in last 7d / 99× 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.

Showing the most recent 100 of 120 total refreshes for this CVE.

  1. 2026-09-19 07:57 UTCVendor advisory
  2. 2026-09-18 20:10 UTCEG score recompute
  3. 2026-09-18 20:10 UTCVendor advisory
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 12:54 UTCVendor advisory
  6. 2026-09-18 00:31 UTCEG score recompute
  7. 2026-09-18 00:31 UTCVendor advisory
  8. 2026-09-17 12:15 UTCVendor advisory
  9. 2026-09-17 00:15 UTCEG score recompute
  10. 2026-09-17 00:15 UTCVendor advisory
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 05:04 UTCVendor advisory
  14. 2026-09-15 16:08 UTCVendor advisory
  15. 2026-09-15 04:21 UTCEG score recompute
  16. 2026-09-15 04:21 UTCVendor advisory
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 16:31 UTCVendor advisory
  19. 2026-09-14 04:39 UTCVendor advisory
  20. 2026-09-13 16:52 UTCEG score recompute
  21. 2026-09-13 16:52 UTCVendor advisory
  22. 2026-09-13 05:05 UTCVendor advisory
  23. 2026-09-12 17:17 UTCEG score recompute
  24. 2026-09-12 17:17 UTCVendor advisory
  25. 2026-09-12 15:02 UTCEPSS rescore
Show 75 more
  1. 2026-09-12 05:30 UTCVendor advisory
  2. 2026-09-11 17:42 UTCEG score recompute
  3. 2026-09-11 17:42 UTCVendor advisory
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 05:16 UTCVendor advisory
  6. 2026-09-10 17:29 UTCEG score recompute
  7. 2026-09-10 17:29 UTCVendor advisory
  8. 2026-09-10 09:35 UTCEPSS rescore
  9. 2026-09-10 05:37 UTCVendor advisory
  10. 2026-09-09 17:49 UTCVendor advisory
  11. 2026-09-09 05:10 UTCEG score recompute
  12. 2026-09-09 05:10 UTCVendor advisory
  13. 2026-09-08 22:01 UTCEPSS rescore
  14. 2026-09-08 04:27 UTCVendor advisory
  15. 2026-09-07 16:39 UTCEG score recompute
  16. 2026-09-07 16:39 UTCVendor advisory
  17. 2026-09-07 01:22 UTCEG score recompute
  18. 2026-09-07 01:22 UTCVendor advisory
  19. 2026-09-06 13:48 UTCEPSS rescore
  20. 2026-09-06 12:30 UTCVendor advisory
  21. 2026-09-06 00:43 UTCEG score recompute
  22. 2026-09-06 00:43 UTCVendor advisory
  23. 2026-09-05 12:54 UTCVendor advisory
  24. 2026-09-05 01:01 UTCEG score recompute
  25. 2026-09-05 01:01 UTCVendor advisory
  26. 2026-09-04 13:12 UTCEG score recompute
  27. 2026-09-04 13:12 UTCVendor advisory
  28. 2026-09-04 05:07 UTCEPSS rescore
  29. 2026-09-04 01:21 UTCVendor advisory
  30. 2026-09-03 12:40 UTCVendor advisory
  31. 2026-09-02 23:24 UTCEG score recompute
  32. 2026-09-02 23:24 UTCVendor advisory
  33. 2026-09-02 14:12 UTCEPSS rescore
  34. 2026-09-01 23:25 UTCEG score recompute
  35. 2026-09-01 23:25 UTCVendor advisory
  36. 2026-09-01 13:54 UTCEPSS rescore
  37. 2026-09-01 11:38 UTCEG score recompute
  38. 2026-09-01 11:38 UTCVendor advisory
  39. 2026-09-01 04:40 UTCEPSS rescore
  40. 2026-09-01 04:40 UTCEPSS rescore
  41. 2026-08-31 21:38 UTCVendor advisory
  42. 2026-08-31 07:58 UTCVendor advisory
  43. 2026-08-30 20:11 UTCEG score recompute
  44. 2026-08-30 20:11 UTCVendor advisory
  45. 2026-08-30 19:18 UTCEPSS rescore
  46. 2026-08-30 19:17 UTCEPSS rescore
  47. 2026-08-30 08:24 UTCEG score recompute
  48. 2026-08-30 08:24 UTCVendor advisory
  49. 2026-08-30 01:22 UTCEPSS rescore
  50. 2026-08-29 20:33 UTCVendor advisory
  51. 2026-08-29 08:26 UTCEG score recompute
  52. 2026-08-29 08:26 UTCVendor advisory
  53. 2026-08-28 21:42 UTCEPSS rescore
  54. 2026-08-28 09:08 UTCVendor advisory
  55. 2026-08-27 19:35 UTCEG score recompute
  56. 2026-08-27 19:35 UTCVendor advisory
  57. 2026-08-27 14:25 UTCEPSS rescore
  58. 2026-08-27 07:20 UTCVendor advisory
  59. 2026-08-26 18:48 UTCEG score recompute
  60. 2026-08-26 18:48 UTCVendor advisory
  61. 2026-08-26 14:47 UTCEPSS rescore
  62. 2026-08-26 05:02 UTCVendor advisory
  63. 2026-08-25 17:13 UTCEG score recompute
  64. 2026-08-25 17:13 UTCVendor advisory
  65. 2026-08-25 13:49 UTCEPSS rescore
  66. 2026-08-25 05:03 UTCVendor advisory
  67. 2026-08-24 17:16 UTCEG score recompute
  68. 2026-08-24 17:16 UTCVendor advisory
  69. 2026-08-23 05:04 UTCEG score recompute
  70. 2026-08-23 00:19 UTCEPSS rescore
  71. 2026-08-22 05:30 UTCEG score recompute
  72. 2026-08-21 23:49 UTCEPSS rescore
  73. 2026-08-21 05:56 UTCEG score recompute
  74. 2026-08-20 22:56 UTCEPSS rescore
  75. 2026-08-19 18:33 UTCEG score recompute

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 September 18, 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 66.4% 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

Explore →

Is Your Infrastructure Affected by CVE-2026-73500?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs