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Advisory severityMedium5.9Red Hat Linux

Medium [CVE-2026-54274] Denial of Service via incomplete websocket frame payloads

This medium-severity Red Hat Linux advisory covers CVE-2026-54274 affecting Exploit Intelligence, Migration Toolkit for Applications 8, OpenShift Lightspeed.

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

CVE-2026-54274 Source published Source updated

VulniPulse record published Record updated

CVE-2026-54274
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, if an attacker sends large incomplete websocket frame payloads, it may be possible to bypass the usual size limits on memory use.

This vulnerability is fixed in 3.14.1. This can bypass normal memory usage limits, potentially leading to a Denial of Service (DoS) where the affected system becomes unavailable.

Exploitation requires aiohttp deployed as a network-facing HTTP server that exposes WebSocket endpoints to untrusted clients. Many Red Hat products ship aiohttp as a bundled dependency for client libraries, internal automation, or services that do not expose WebSocket listeners to untrusted users.

In those configurations, practical risk may be lower, but affected packages should still be updated to aiohttp 3.14.1 or later when fixes are released. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-770. Affected Red Hat products: Exploit Intelligence; Migration Toolkit for Applications 8; OpenShift Lightspeed; Red Hat AI Inference Server; Red Hat Ansible Automation Platform 2; Red Hat Ansible Automation Platform Ansible Core 2; Red Hat Discovery 2; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI); Red Hat Satellite 6.

Is CVE-2026-54274 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-54274 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-2026-54274?

Upgrade to a fixed release named by Red Hat:

  • 3.14.1

Confirm against the vendor advisory before you patch.

Affected versions
  • < 3.14.1

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

Fixed versions
  • 3.14.1

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

Mitigation checklist

Recommended fix / mitigation
  • Update the aiohttp package to version 3.14.1 or later. Until updated builds are available, reduce exposure by not exposing aiohttp-based HTTP servers with WebSocket endpoints directly to untrusted networks. A reverse proxy or load balancer in front of the service can help limit abusive WebSocket traffic. Installations that use aiohttp only as an HTTP client, or that do not expose WebSocket endpoints, are not affected by this flaw.

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

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