agronholm AnyIO up to 4.14.1 Process Pool resource consumption

Summaryinfo

A vulnerability was found in agronholm AnyIO up to 4.14.1. It has been declared as problematic. Affected by this issue is some unknown functionality of the component Process Pool. Such manipulation leads to resource consumption. This vulnerability is uniquely identified as CVE-2026-64847. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in agronholm AnyIO up to 4.14.1. It has been rated as problematic. Affected by this issue is some unknown processing of the component Process Pool. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-64847 since 07/20/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 4.14.2 eliminates this vulnerability.

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Productinfo

Vendor

• agronholm

Name

• AnyIO

Version

• 4.14.0
• 4.14.1

Website

• Product: https://github.com/agronholm/anyio/

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