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Advisory severityMedium4.8Red Hat Linux

Medium [CVE-2026-54275] TLS SNI check bypass via connection reuse

This medium-severity Red Hat Linux advisory covers CVE-2026-54275 affecting Exploit Intelligence, Migration Toolkit for Applications 8, OpenShift Lightspeed.

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

CVE-2026-54275 Source published Source updated

VulniPulse record published Record updated

CVE-2026-54275
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, the server_hostname TLS SNI check can be bypassed when an existing connection is reused.

This vulnerability is fixed in 3.14.1. This vulnerability allows a remote attacker to bypass the Transport Layer Security (TLS) Server Name Indication (SNI) check.

This occurs when an application reuses an existing connection for multiple requests to the same domain but with different server_hostname parameters.

Consequently, later requests may succeed by reusing the existing connection, even if they should have been rejected due to the TLS SNI check, potentially leading to unintended information disclosure or integrity issues.

Exploitation requires an application using aiohttp as an HTTPS client with connection pooling enabled, issuing multiple requests to the same host with differing server_hostname overrides. Many Red Hat products ship aiohttp as a bundled dependency without this usage pattern.

Affected packages should still be updated to aiohttp 3.14.1 or later when fixes are released. Red Hat severity: Moderate — CVSS 4.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).

Weakness: CWE-367.

Affected products named by the advisory: Exploit Intelligence; Migration Toolkit for Applications 8; OpenShift Lightspeed; Red Hat AI Inference Server; and 6 more.

Is CVE-2026-54275 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-54275 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-2026-54275?

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, disable HTTP keep-alive (keep_alive) for aiohttp client sessions where per-request server_hostname TLS SNI overrides must be enforced between requests to the same host. Installations that do not use per-request server_hostname overrides, or that use aiohttp only as a server, are not affected by this flaw.

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

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