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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-59725] Denial of Service via invalid binary POST requests

This high-severity Red Hat Linux advisory covers CVE-2026-59725 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-2026-59725 Source published Source updated

VulniPulse record published Record updated

CVE-2026-59725
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets.

This issue is fixed in version 6.6.7. A flaw was found in Socket.IO, specifically within the Engine.IO protocol v4 polling transport.

This improper handling of requests prevents the HTTP response from being properly closed, which can lead to the exhaustion of server-side connections and sockets. The primary consequence is a Denial of Service (DoS), making the affected service unavailable to legitimate users.

This flaw has been rated as Important. This can lead to server-side connection exhaustion and a denial of service, impacting the availability of applications utilizing Socket.IO.

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-772.

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-2026:37577, RHSA-2026:42986.

Is CVE-2026-59725 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-59725 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-2026-59725?

Upgrade to a fixed release named by Red Hat:

  • 6.6.7
  • dotnet8-0-main-8.0.128-1.1.hum1
  • dotnet8-0-main-8.0.28-1.1.hum1
  • dotnet8-0-main-8.0.129-2.hum1
  • RHSA-2026:37577
  • RHSA-2026:42986

Confirm against the vendor advisory before you patch.

Affected versions
  • < 4.1.0
  • < 6.6.7

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Fixed versions
  • 6.6.7
  • dotnet8-0-main-8.0.128-1.1.hum1
  • dotnet8-0-main-8.0.28-1.1.hum1
  • dotnet8-0-main-8.0.129-2.hum1
  • RHSA-2026:37577
  • RHSA-2026:42986

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Mitigation

Upgrade to a fixed release: 6.6.7, dotnet8-0-main-8.0.128-1.1.hum1, dotnet8-0-main-8.0.28-1.1.hum1, dotnet8-0-main-8.0.129-2.hum1, RHSA-2026:37577, RHSA-2026:42986. 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 13 days ago·verify at source

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