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CVE-2026-63374 Details

Description

AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, connect_tcp() and TLSStream.wrap() can validate internationalized host names after the standard library converts them with IDNA 2003 instead of IDNA 2008. When a connection to a non-ASCII domain is hijacked or redirected, an attacker can obtain a legitimate certificate for the different ASCII hostname produced by IDNA 2003 and present it to the client, causing the malicious endpoint's certificate to validate. This issue is fixed in version 4.14.2.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/agronholm/anyio/commit/68f58915f82d9be8109ebbbd8f5d70577d43f2ce	[email protected]
https://github.com/agronholm/anyio/pull/1208	[email protected]
https://github.com/agronholm/anyio/releases/tag/4.14.2	[email protected]
https://github.com/agronholm/anyio/security/advisories/GHSA-82r6-8w77-94w6	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-295	Improper Certificate Validation	[email protected]
CWE-297	Improper Validation of Certificate with Host Mismatch	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes