CVE-2026-73565

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd percentile of EPSS-scored CVEs). 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

@hono/node-server allows running the Hono application on Node.js. From 2.0.0 until 2.0.10, a WebSocket upgrade request to an upgradeWebSocket route with a missing or malformed Sec-WebSocket-Key header causes src/websocket.ts to retain the request's IncomingMessage in waiterMap and leave waitForWebSocket pending because ws.handleUpgrade emits no connection event. The aborted handshake therefore has no cleanup path, allowing an unauthenticated attacker to flood a public route, cause unbounded memory growth, and eventually make the service unavailable. This issue is fixed in version 2.0.10.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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
Severity53% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 13, 2026

Last Modified

September 10, 2026

Advisory Details (3)

Auto-updated Aug 13, 2026
Patch available. Sources: github_release, github, github_commit.
github_release Patch Available

v2.0.10

Patch available: honojs/node-server v2.0.10

https://github.com/honojs/node-server/releases/tag/v2.0.10
github_commit Patch Available

commit 3a21938c4183 (honojs/node-server)

Patch available: honojs/node-server v2.0.10 (contains commit 3a21938c4183)

https://github.com/honojs/node-server/commit/3a21938c418340e980cb7ffa88e78369f78392d1
githubMentions a patch (unverified)

Unauthenticated memory-leak DoS via aborted WebSocket handshake · Advisory · honojs/node-server · GitHub

https://github.com/honojs/node-server/security/advisories/GHSA-9mqv-5hh9-4cgg

Vendor Advisories for CVE-2026-73565(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)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
@hono/node-server—
  • 2.0.0 up to 2.0.10: fixed in 2.0.10
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 40× 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. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 15:18 UTCEPSS rescore
  6. 2026-10-06 13:20 UTCEG score recompute
  7. 2026-10-05 17:43 UTCEPSS rescore
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  9. 2026-10-03 19:48 UTCEG score recompute
  10. 2026-10-03 14:26 UTCEPSS rescore
  11. 2026-10-02 07:32 UTCEG score recompute
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-09-30 21:46 UTCEG score recompute
  14. 2026-09-29 15:24 UTCEPSS rescore
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  16. 2026-09-28 12:15 UTCEG score recompute
  17. 2026-09-27 13:48 UTCEPSS rescore
  18. 2026-09-27 09:43 UTCEG score recompute
  19. 2026-09-26 15:59 UTCEPSS rescore
  20. 2026-09-25 03:49 UTCEG score recompute
  21. 2026-09-24 01:50 UTCEG score recompute
  22. 2026-09-23 17:54 UTCEPSS rescore
  23. 2026-09-22 23:49 UTCEG score recompute
  24. 2026-09-21 21:20 UTCEG score recompute
  25. 2026-09-21 21:09 UTCEPSS rescore
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  1. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-19 17:18 UTCEG score recompute
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 15:18 UTCEG score recompute
  5. 2026-09-17 13:18 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 10:28 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 06:18 UTCEG score recompute
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-14 03:54 UTCEG score recompute
  12. 2026-09-13 01:55 UTCEG score recompute
  13. 2026-09-12 15:02 UTCEPSS rescore
  14. 2026-09-11 23:55 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-10 20:38 UTCEG score recompute
  17. 2026-09-10 09:35 UTCEPSS rescore
  18. 2026-09-09 04:56 UTCEG score recompute
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-07 07:16 UTCEG score recompute
  21. 2026-09-06 13:48 UTCEPSS rescore
  22. 2026-09-06 05:14 UTCEG score recompute
  23. 2026-09-05 03:13 UTCEG score recompute
  24. 2026-09-04 05:07 UTCEPSS rescore
  25. 2026-09-02 23:11 UTCEG score recompute
  26. 2026-09-02 14:12 UTCEPSS rescore
  27. 2026-09-01 15:12 UTCEG score recompute
  28. 2026-09-01 13:54 UTCEPSS rescore
  29. 2026-09-01 04:40 UTCEPSS rescore
  30. 2026-09-01 04:40 UTCEPSS rescore
  31. 2026-08-31 11:39 UTCEG score recompute
  32. 2026-08-30 19:18 UTCEPSS rescore
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  34. 2026-08-30 09:36 UTCEG score recompute
  35. 2026-08-30 01:22 UTCEPSS rescore
  36. 2026-08-29 07:33 UTCEG score recompute
  37. 2026-08-28 21:42 UTCEPSS rescore
  38. 2026-08-27 19:32 UTCEG score recompute
  39. 2026-08-27 14:25 UTCEPSS rescore
  40. 2026-08-26 16:27 UTCEG score recompute
  41. 2026-08-26 14:47 UTCEPSS rescore
  42. 2026-08-25 13:49 UTCEPSS rescore
  43. 2026-08-25 13:36 UTCEG score recompute
  44. 2026-08-24 11:36 UTCEG score recompute
  45. 2026-08-23 09:36 UTCEG score recompute
  46. 2026-08-23 00:19 UTCEPSS rescore
  47. 2026-08-22 07:34 UTCEG score recompute
  48. 2026-08-21 23:49 UTCEPSS rescore
  49. 2026-08-21 05:34 UTCEG score recompute
  50. 2026-08-20 22:56 UTCEPSS rescore
  51. 2026-08-20 03:34 UTCEG score recompute
  52. 2026-08-19 17:04 UTCEPSS rescore
  53. 2026-08-19 01:34 UTCEG score recompute
  54. 2026-08-18 13:49 UTCEPSS rescore
  55. 2026-08-18 13:49 UTCEPSS rescore
  56. 2026-08-17 23:34 UTCEG score recompute
  57. 2026-08-17 13:47 UTCEPSS rescore
  58. 2026-08-16 21:34 UTCEG score recompute
  59. 2026-08-16 14:56 UTCEPSS rescore
  60. 2026-08-16 14:56 UTCEPSS rescore
  61. 2026-08-16 02:15 UTCEPSS rescore
  62. 2026-08-15 19:34 UTCEG score recompute
  63. 2026-08-15 01:31 UTCEPSS rescore
  64. 2026-08-14 17:34 UTCEG score recompute
  65. 2026-08-14 17:07 UTCEG score recompute
  66. 2026-08-13 18:18 UTCEG score recompute
  67. 2026-08-13 17:47 UTCEG score recompute
  68. 2026-08-13 17:46 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-73565?
CVE-2026-73565 is a medium vulnerability published on August 13, 2026. @hono/node-server allows running the Hono application on Node.js. From 2.0.0 until 2.0.10, a WebSocket upgrade request to an upgradeWebSocket route with a missing or malformed Sec-WebSocket-Key header causes src/websocket.ts to retain the request's IncomingMessage in waiterMap and leave…
When was CVE-2026-73565 disclosed?
CVE-2026-73565 was first published on August 13, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73565 actively exploited?
CVE-2026-73565 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73565?
CVE-2026-73565 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73565?
A fix for CVE-2026-73565 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73565 are linked in the Vendor Advisories panel on this page.

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