---
cve: "CVE-2026-59881"
severity: "MEDIUM"
cvss: 6.9
epss: "30%"
vendor: "aio-libs"
kev: false
exploited: false
published: "2026-07-30 19:18:33"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T08:53:58+02:00"
---

# CVE-2026-59881

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
```

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

## Patch verfügbar (OSV)

- c1b9212ad3d93c24b5fc66ad0849597166bc816e (Commit)
- 47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6 (Commit)

## Referenzen

- <https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7>
- <https://github.com/aio-libs/aiohttp/pull/12978>
- <https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6>
- <http://github.com/aio-libs/aiohttp/releases/tag/v3.14.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-59881) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_