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CVE-2026-64847— AnyIO process-pool workers can block indefinitely on undrained stderr

Quick assessment

Affected
agronholm anyio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 docume

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-64847

Vulnerability Information

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Vulnerability Title
AnyIO process-pool workers can block indefinitely on undrained stderr
Source: CVE Program / CVE List V5
Vulnerability 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, 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
agronholm anyio < 4.14.2 -

II. Public POCs for CVE-2026-64847

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III. Intelligence Information for CVE-2026-64847

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Patches & Fixes for CVE-2026-64847 (2)

Other References for CVE-2026-64847 (2)

IV. Related Vulnerabilities

Same product: anyio
Same vendor: agronholm
Same weakness: CWE-770

V. Comments for CVE-2026-64847

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