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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-59724] Denial of Service via crafted WebTransport session ID

This high-severity Red Hat Linux advisory covers CVE-2026-59724 affecting Red Hat Hardened Images, Red Hat Enterprise Linux AI (RHEL AI) 3.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-59724 Source published Source updated

VulniPulse record published Record updated

CVE-2026-59724
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

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. A flaw was found in Engine.IO.

This can lead to a TypeError, resulting in a denial of service (DoS) for the server. This vulnerability impacts the availability of the service.

This flaw has been rated as Important. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-843. Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux AI (RHEL AI) 3.

Will not fix / out of support: Red Hat Enterprise Linux AI (RHEL AI) 3. Red Hat fixing advisory: RHSA-2026:26994.

Is CVE-2026-59724 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-59724 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-59724?

Upgrade to a fixed release named by Red Hat:

  • 6.6.7
  • dotnet8-0-main-8.0.128-1.hum1
  • RHSA-2026:26994

Confirm against the vendor advisory before you patch.

Affected versions
  • < 6.5.0
  • < 6.6.7

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Fixed versions
  • 6.6.7
  • dotnet8-0-main-8.0.128-1.hum1
  • RHSA-2026:26994

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Mitigation

Upgrade to a fixed release: 6.6.7, dotnet8-0-main-8.0.128-1.hum1, RHSA-2026:26994. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

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