{"id":"CVE-2026-64847","published":"2026-09-18T18:17:10.930","lastModified":"2026-09-24T21:25:27.050","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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-770"],"vendors":[],"products":[],"references":[{"url":"https://github.com/agronholm/anyio/commit/f1b7301c8264b0d2e8d24a5788fd29e93dea4040","tags":[]},{"url":"https://github.com/agronholm/anyio/pull/1207","tags":[]},{"url":"https://github.com/agronholm/anyio/releases/tag/4.14.2","tags":[]},{"url":"https://github.com/agronholm/anyio/security/advisories/GHSA-5p39-cfhj-2xmp","tags":[]}],"exploitRefs":[{"url":"https://github.com/agronholm/anyio/commit/f1b7301c8264b0d2e8d24a5788fd29e93dea4040","tags":[]},{"url":"https://github.com/agronholm/anyio/pull/1207","tags":[]},{"url":"https://github.com/agronholm/anyio/releases/tag/4.14.2","tags":[]},{"url":"https://github.com/agronholm/anyio/security/advisories/GHSA-5p39-cfhj-2xmp","tags":[]}],"hasPoc":true,"ai":null}