---
cve: "CVE-2026-31958"
severity: "HIGH"
cvss: 8.7
epss: "38%"
vendor: "tornadoweb"
kev: false
exploited: false
published: "2026-03-11 20:16:16"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T20:52:49+02:00"
---

# CVE-2026-31958

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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)

- 7d6465056ceb7a054b3f64cf1c18271753b10482 (Commit)

## Referenzen

- <https://github.com/tornadoweb/tornado/security/advisories/GHSA-qjxf-f2mg-c6mc>
- <https://lists.debian.org/debian-lts-announce/2026/04/msg00000.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-31958) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_