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.
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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. Red Hat fixing advisory: RHSA-2026:37577, RHSA-2026:42986.
- < 4.1.0
- < 6.6.7
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 6.6.7
- dotnet8-0-main-8.0.128-1.1.hum1
- dotnet8-0-main-8.0.129-2.hum1
- RHSA-2026:37577
- RHSA-2026:42986
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation
Upgrade to a fixed release: 6.6.7, dotnet8-0-main-8.0.128-1.1.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 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
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