---
cve: "CVE-2026-91990"
severity: "HIGH"
cvss: 8.7
epss: "0.4%"
vendor: "tornadoweb"
kev: false
exploited: false
published: "2026-09-15 16:17:58"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T06:50:33+02:00"
---

# CVE-2026-91990

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit. Attackers can send crafted multipart requests with many parts to create large transient lists, exhausting server memory and causing denial of service.

## 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)

- a55abe3e3bf59994f29b2f7084c46341f0d4f6a7 (Commit)

## Referenzen

- <https://github.com/tornadoweb/tornado/security/advisories/GHSA-8423-8fgw-73vq>
- <https://www.vulncheck.com/advisories/tornado-before-6.5.8-memory-amplification-dos-via-multipart>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-91990) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_