CVE-2026-59724

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

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
7.5(medium)
EPSS
26.0%
KEV
Not listed

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 Patch Available

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 29× 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. 2026-07-15 18:41 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 07:13 UTCEG score recompute
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-15 02:00 UTCEPSS rescore
  7. 2026-07-14 19:50 UTCEG score recompute
  8. 2026-07-14 08:27 UTCEG score recompute
  9. 2026-07-13 22:31 UTCEPSS rescore
  10. 2026-07-13 21:04 UTCEG score recompute
  11. 2026-07-13 09:41 UTCEG score recompute
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-12 22:18 UTCEG score recompute
  15. 2026-07-12 10:55 UTCEG score recompute
  16. 2026-07-12 05:46 UTCEPSS rescore
  17. 2026-07-11 23:32 UTCEG score recompute
  18. 2026-07-11 12:09 UTCEG score recompute
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-11 08:27 UTCEPSS rescore
  21. 2026-07-11 00:46 UTCEG score recompute
  22. 2026-07-10 13:23 UTCEG score recompute
  23. 2026-07-10 01:57 UTCEG score recompute
  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-09 19:10 UTCEPSS rescore
Show 4 more
  1. 2026-07-09 14:34 UTCEG score recompute
  2. 2026-07-09 03:11 UTCEG score recompute
  3. 2026-07-08 15:46 UTCEG score recompute
  4. 2026-07-08 15:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59724?
CVE-2026-59724 is a high vulnerability 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 CVE-2026-59724 disclosed?
CVE-2026-59724 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59724 actively exploited?
CVE-2026-59724 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-59724?
CVE-2026-59724 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59724?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59724, 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

Explore the affected products and dependency analysis for 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.

Start Free Scan →Browse All CVEs