---
cve: "CVE-2026-49853"
severity: "HIGH"
cvss: 7.7
epss: "37%"
vendor: "tornadoweb"
kev: false
exploited: false
published: "2026-07-14 21:17:02"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T10:57:26+02:00"
---

# CVE-2026-49853

> 7.7 HIGH · 🧪 PoC

## Beschreibung

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient shallow-copied redirected requests and removed only the Host header, leaving Authorization, auth_username, auth_password, and auth_mode in place when a redirect changed scheme, host, or port. This issue is fixed in version 6.5.6.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- aba2569f7ed7a6bdbef816658fb6b7182531b751 (Commit)

## Referenzen

- <https://github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf>
- <https://github.com/tornadoweb/tornado/pull/3626>
- <https://github.com/tornadoweb/tornado/commit/aba2569f7ed7a6bdbef816658fb6b7182531b751>
- <https://github.com/tornadoweb/tornado/releases/tag/v6.5.6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-49853) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_