CVE-2026-59724

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-31. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-42312 (ENISA EUVD) · GHSA-gr94-w7qr-f4j3 (GitHub Security Advisories)Source: ENISA EUVD

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 impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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
49th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-07). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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.

The score's inputs: 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

October 25, 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 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(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatdotnet8-0-main-8.0.128-1.hum12026-06-18redhat
npmengine.io @ 6.6.7 (fixes >= 6.5.0, < 6.6.7)—ghsa

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 9× in last 7d / 37× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 276 rows 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 176 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:53 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  2. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  3. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  4. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  5. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  6. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  7. 2026-11-08 12:37 UTCEchelonGraph re-scored
  8. 2026-11-08 12:37 UTCVendor advisory
  9. 2026-11-08 12:37 UTCGHSA enrichmentGHSA-gr94-w7qr-f4j3 · GitHub severity HIGH · GitHub CVSS 7.5
  10. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  11. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  12. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  13. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  14. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  15. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  16. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  17. 2026-11-01 16:33 UTCVendor advisory
  18. 2026-11-01 16:32 UTCGHSA enrichmentGHSA-gr94-w7qr-f4j3 · GitHub severity HIGH · GitHub CVSS 7.5
  19. 2026-11-01 07:42 UTCGHSA enrichmentGHSA-gr94-w7qr-f4j3 · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-11-01 07:42 UTCEchelonGraph re-scored
  21. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  22. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  23. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  24. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  25. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
Show 75 more
  1. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-10-25 20:26 UTCEchelonGraph re-scored
  3. 2026-10-25 20:26 UTCVendor advisory
  4. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-10-25 14:16 UTCEchelonGraph re-scored
  6. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  7. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-10-20 18:57 UTCEchelonGraph re-scored
  11. 2026-10-20 18:57 UTCVendor advisory
  12. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  15. 2026-10-18 03:27 UTCEchelonGraph re-scored
  16. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  19. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  20. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  21. 2026-10-13 15:51 UTCEchelonGraph re-scored
  22. 2026-10-13 15:51 UTCVendor advisory
  23. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  24. 2026-10-12 15:52 UTCEchelonGraph re-scored
  25. 2026-10-11 19:36 UTCEchelonGraph re-scored
  26. 2026-10-11 16:51 UTCEchelonGraph re-scored
  27. 2026-10-11 14:13 UTCEchelonGraph re-scored
  28. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  29. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  30. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  31. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  32. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  33. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  34. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  35. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  36. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  37. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  38. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  39. 2026-10-01 16:12 UTCEchelonGraph re-scored
  40. 2026-10-01 16:12 UTCVendor advisory
  41. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  42. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  43. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  44. 2026-09-28 13:23 UTCEchelonGraph re-scored
  45. 2026-09-28 13:23 UTCVendor advisory
  46. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  47. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  48. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  49. 2026-09-24 11:52 UTCEchelonGraph re-scored
  50. 2026-09-24 11:52 UTCVendor advisory
  51. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  52. 2026-09-23 06:11 UTCEchelonGraph re-scored
  53. 2026-09-23 06:11 UTCVendor advisory
  54. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  55. 2026-09-18 05:44 UTCEchelonGraph re-scored
  56. 2026-09-18 05:44 UTCVendor advisory
  57. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  58. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  59. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  60. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  61. 2026-09-14 11:15 UTCVendor advisory
  62. 2026-09-13 23:50 UTCEchelonGraph re-scored
  63. 2026-09-13 23:50 UTCVendor advisory
  64. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  65. 2026-09-13 08:25 UTCEchelonGraph re-scored
  66. 2026-09-13 08:25 UTCVendor advisory
  67. 2026-09-12 14:58 UTCVendor advisory
  68. 2026-09-12 03:35 UTCEchelonGraph re-scored
  69. 2026-09-12 03:35 UTCVendor advisory
  70. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  71. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  72. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  73. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  74. 2026-09-06 14:03 UTCEchelonGraph re-scored
  75. 2026-09-06 14:03 UTCVendor advisory

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 October 25, 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 (49th 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

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