High7.5Red 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.

CVE-2026-59724 Published Jul 8, 2026Updated by vendor Jul 8, 2026

CVE-2026-59724

Affected products & platforms

Red Hat LinuxUnclassified

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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.

Red Hat fixing advisory: RHSA-2026:26994.

Affected versions

< 6.5.0
< 6.6.7

Official advisory · high-confidence parse· fetched 12 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 12 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 additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 12 days ago·verify at source

Discussion(0)

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