---
cve: "CVE-2026-34525"
severity: "MEDIUM"
cvss: 6.3
epss: "29%"
vendor: "aio-libs"
kev: false
exploited: false
published: "2026-04-01 21:17:00"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T05:27:41+02:00"
---

# CVE-2026-34525

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, multiple Host headers were allowed in aiohttp. This issue has been patched in version 3.13.4.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 9f7c7ab6f2924824e4a61a3b5c5c36475f4e25c6 (Commit)
- 53e2e6fc58b89c6185be7820bd2c9f40216b3000 (Commit)

## Referenzen

- <https://github.com/aio-libs/aiohttp/security/advisories/GHSA-c427-h43c-vf67>
- <https://github.com/aio-libs/aiohttp/commit/53e2e6fc58b89c6185be7820bd2c9f40216b3000>
- <https://github.com/aio-libs/aiohttp/commit/e00ca3cca92c465c7913c4beb763a72da9ed8349>
- <https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34525) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_