CVE-2026-59724

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (47th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as __proto__ through an inherited property of the clients object during WebTransport upgrade handling, causing a TypeError and denial of service. This issue is fixed in version 6.6.7.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
0.6%
EPSS %ILE
47th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 8, 2026

Last Modified

July 13, 2026

Advisory Details (3)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Engine.IO WebTransport SID DoS · Advisory · socketio/socket.io · GitHub

https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3
GitHub release Patch Available

[email protected]

Patch available: socketio/socket.io [email protected]

https://github.com/socketio/socket.io/releases/tag/[email protected]
GitHub commit Patch Available

commit 1fa1f46cd420 (socketio/socket.io)

Patch available: socketio/socket.io [email protected] (contains commit 1fa1f46cd420)

https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c

Vendor Advisories for CVE-2026-59724(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 / EcosystemFix (by version range) / PatchReleasedSource
redhatdotnet8-0-main-8.0.128-1.hum12026-06-18redhat

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

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
engine.io—
  • 6.5.0 up to 6.6.7: fixed in 6.6.7
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 41× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 232 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 132 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  2. 2026-10-13 15:51 UTCEG score recompute
  3. 2026-10-13 15:51 UTCVendor advisory
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  5. 2026-10-12 15:52 UTCEG score recompute
  6. 2026-10-11 19:36 UTCEG score recompute
  7. 2026-10-11 16:51 UTCEG score recompute
  8. 2026-10-11 14:13 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  20. 2026-10-01 16:12 UTCEG score recompute
  21. 2026-10-01 16:12 UTCVendor advisory
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  23. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  24. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  25. 2026-09-28 13:23 UTCEG score recompute
Show 75 more
  1. 2026-09-28 13:23 UTCVendor advisory
  2. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  3. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  4. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  5. 2026-09-24 11:52 UTCEG score recompute
  6. 2026-09-24 11:52 UTCVendor advisory
  7. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-09-23 06:11 UTCEG score recompute
  9. 2026-09-23 06:11 UTCVendor advisory
  10. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  11. 2026-09-18 05:44 UTCEG score recompute
  12. 2026-09-18 05:44 UTCVendor advisory
  13. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  15. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  17. 2026-09-14 11:15 UTCVendor advisory
  18. 2026-09-13 23:50 UTCEG score recompute
  19. 2026-09-13 23:50 UTCVendor advisory
  20. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  21. 2026-09-13 08:25 UTCEG score recompute
  22. 2026-09-13 08:25 UTCVendor advisory
  23. 2026-09-12 14:58 UTCVendor advisory
  24. 2026-09-12 03:35 UTCEG score recompute
  25. 2026-09-12 03:35 UTCVendor advisory
  26. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  27. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  28. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  29. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  30. 2026-09-06 14:03 UTCEG score recompute
  31. 2026-09-06 14:03 UTCVendor advisory
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  33. 2026-09-05 22:48 UTCEG score recompute
  34. 2026-09-05 22:48 UTCVendor advisory
  35. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  36. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  37. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  38. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  39. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  40. 2026-08-30 19:00 UTCVendor advisory
  41. 2026-08-30 07:36 UTCEG score recompute
  42. 2026-08-30 07:36 UTCVendor advisory
  43. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  44. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  45. 2026-08-27 21:50 UTCEG score recompute
  46. 2026-08-27 21:50 UTCVendor advisory
  47. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  48. 2026-08-27 01:30 UTCEG score recompute
  49. 2026-08-27 01:30 UTCVendor advisory
  50. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  51. 2026-08-26 08:24 UTCEG score recompute
  52. 2026-08-26 08:24 UTCVendor advisory
  53. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  54. 2026-08-25 11:41 UTCVendor advisory
  55. 2026-08-25 00:12 UTCEG score recompute
  56. 2026-08-25 00:12 UTCVendor advisory
  57. 2026-08-24 12:48 UTCEG score recompute
  58. 2026-08-24 12:48 UTCVendor advisory
  59. 2026-08-24 01:25 UTCVendor advisory
  60. 2026-08-23 13:58 UTCVendor advisory
  61. 2026-08-23 02:36 UTCEG score recompute
  62. 2026-08-23 02:36 UTCVendor advisory
  63. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  64. 2026-08-22 15:12 UTCVendor advisory
  65. 2026-08-22 03:49 UTCEG score recompute
  66. 2026-08-22 03:49 UTCVendor advisory
  67. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  68. 2026-08-21 15:22 UTCVendor advisory
  69. 2026-08-21 03:59 UTCEG score recompute
  70. 2026-08-21 03:59 UTCVendor advisory
  71. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  72. 2026-08-20 15:37 UTCVendor advisory
  73. 2026-08-20 02:00 UTCEG score recompute
  74. 2026-08-20 02:00 UTCVendor advisory
  75. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 26th percentile

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-59724?
CVE-2026-59724 is a high-severity vulnerability; its CVE record was published on July 8, 2026. Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as proto through an inherited property of the clients object during WebTransport upgrade handling, causing a…
When was the CVE record for CVE-2026-59724 published?
The CVE record for CVE-2026-59724 was published on July 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 13, 2026; the record at its source may have been updated since.
Is CVE-2026-59724 actively exploited?
CVE-2026-59724 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59724?
CVE-2026-59724 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59724?
A fix for CVE-2026-59724 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59724 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-59724

Explore →

Is Your Infrastructure Affected by CVE-2026-59724?

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

Book a Demo →Browse All CVEs