---
cve: "CVE-2026-64847"
severity: "MEDIUM"
cvss: 6.8
epss: "0.1%"
vendor: "agronholm"
kev: false
exploited: false
published: "2026-09-18 18:17:10"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T10:04:15+02:00"
---

# CVE-2026-64847

> 6.8 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- f1b7301c8264b0d2e8d24a5788fd29e93dea4040 (Commit)
- c384f99687c64c59ed8a11c3a0f11a2d57daff71 (Commit)

## Referenzen

- <https://github.com/agronholm/anyio/security/advisories/GHSA-5p39-cfhj-2xmp>
- <https://github.com/agronholm/anyio/pull/1207>
- <https://github.com/agronholm/anyio/commit/f1b7301c8264b0d2e8d24a5788fd29e93dea4040>
- <https://github.com/agronholm/anyio/releases/tag/4.14.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-64847) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_